diff --git a/Sources/EFMapping/EFChampionMapper.cs b/Sources/EFMapping/EFChampionMapper.cs
index 4053663..beb6d02 100644
--- a/Sources/EFMapping/EFChampionMapper.cs
+++ b/Sources/EFMapping/EFChampionMapper.cs
@@ -1,5 +1,7 @@
 using EFlib;
 using Model;
+using System.Collections.Immutable;
+using System.Reflection.PortableExecutable;
 
 namespace EFMapping
 {
@@ -19,10 +21,11 @@ namespace EFMapping
                     Icon = Champ.Icon,
                     Class = Champ.Class,
                     Image = new() { Id = Guid.NewGuid(), Base64 = Champ.Image.Base64 },
-                    Skills = Champ.Skills.Select(Skill => Skill.toEF(EfChampion, context)).ToList(),
-                    Characteristics = Champ.Characteristics.Select(Charac => Charac.toEF(EfChampion, context)).ToList()
 
-                };               
+
+                };
+                EfChampion.Skills = Champ.Skills.Select(skill => skill.toEF(EfChampion, context)).ToList();
+                EfChampion.Characteristics = Champ.Characteristics.Select(Charac => Charac.toEF(EfChampion, context)).ToList();
             }
             return EfChampion;
 
diff --git a/Sources/EFMapping/EFCharacteristicsMapper.cs b/Sources/EFMapping/EFCharacteristicsMapper.cs
index 306a968..779d95e 100644
--- a/Sources/EFMapping/EFCharacteristicsMapper.cs
+++ b/Sources/EFMapping/EFCharacteristicsMapper.cs
@@ -26,13 +26,7 @@ namespace EFMapping
             return EfCharacteristics;
         }
 
-        public static ReadOnlyDictionary<string, int> toModel(this EFCharacteristics charac)
-        {
-            var dict = new Dictionary<string, int>
-            {
-                { charac.Name, charac.Value }
-            };
-            return new(dict);
-        }    
+        public static Tuple<string, int> toModel(this EFCharacteristics Charac)=> new(Charac.Name, Charac.Value);
+
     }
 }
diff --git a/Sources/EFMapping/EFSkillMapper.cs b/Sources/EFMapping/EFSkillMapper.cs
index 292c717..1a615dc 100644
--- a/Sources/EFMapping/EFSkillMapper.cs
+++ b/Sources/EFMapping/EFSkillMapper.cs
@@ -10,7 +10,7 @@ namespace EFMapping
 {
     public static class EFSkillMapper
     {
-        public static EFSkill toEF(this Skill skill, SQLiteContext context)
+        public static EFSkill toEF(this Skill skill, EFChampion champ, SQLiteContext context)
         {
             var EfSkill = context.Skills.Find(skill.Name);
             if (EfSkill == null)
@@ -19,9 +19,11 @@ namespace EFMapping
                 {
                     Name = skill.Name,
                     Description = skill.Description,
-                    Type = skill.Type
+                    Type = skill.Type,
+                    Champions = new List<EFChampion>() { champ }
                 };
             }
+            EfSkill!.Champions?.Add(champ);
             return EfSkill;
         }
         public static Skill toModel(this EFSkill skill)=> new(skill.Name, skill.Type, skill.Description);
diff --git a/Sources/EFlib/EFChampion.cs b/Sources/EFlib/EFChampion.cs
index 90b8317..97a9b2a 100644
--- a/Sources/EFlib/EFChampion.cs
+++ b/Sources/EFlib/EFChampion.cs
@@ -20,12 +20,12 @@ namespace EFlib
         public string Icon { get; set; }
 
         // Propriété de navigation pour les paires clé-valeur
-        public ICollection<EFCharacteristics> Characteristics { get; set; }
+        public virtual ICollection<EFCharacteristics> Characteristics { get; set; }
 
         [Required]
         public ChampionClass Class { get; set; }
         public ReadOnlyCollection<EFSkin>? Skins { get; set; }
-        public ImmutableHashSet<EFSkill> Skills { get; set; }
+        public virtual ICollection<EFSkill> Skills { get; set; }
 
         public Guid ImageId { get; set; }
         [ForeignKey("ImageId")]
diff --git a/Sources/EFlib/EFSkill.cs b/Sources/EFlib/EFSkill.cs
index 16825bc..7d68e6e 100644
--- a/Sources/EFlib/EFSkill.cs
+++ b/Sources/EFlib/EFSkill.cs
@@ -12,8 +12,15 @@ namespace EFlib
     public class EFSkill
     {
         [Key]
+        [MaxLength(250)]
         public string Name { get; set; }
+
+        [Required]
+        [MaxLength(500)]
         public string Description { get; set; }
+        [Required]
         public SkillType Type { get; set; }
+
+        public virtual ICollection<EFChampion>? Champions { get; set; }
     }
 }
diff --git a/Sources/EFlib/Migrations/20230322115837_myMigration.Designer.cs b/Sources/EFlib/Migrations/20230322184745_myMigration.Designer.cs
similarity index 85%
rename from Sources/EFlib/Migrations/20230322115837_myMigration.Designer.cs
rename to Sources/EFlib/Migrations/20230322184745_myMigration.Designer.cs
index 8d749e0..4dbae5d 100644
--- a/Sources/EFlib/Migrations/20230322115837_myMigration.Designer.cs
+++ b/Sources/EFlib/Migrations/20230322184745_myMigration.Designer.cs
@@ -11,7 +11,7 @@ using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 namespace EFlib.Migrations
 {
     [DbContext(typeof(SQLiteContext))]
-    [Migration("20230322115837_myMigration")]
+    [Migration("20230322184745_myMigration")]
     partial class myMigration
     {
         /// <inheritdoc />
@@ -20,6 +20,21 @@ namespace EFlib.Migrations
 #pragma warning disable 612, 618
             modelBuilder.HasAnnotation("ProductVersion", "7.0.2");
 
+            modelBuilder.Entity("EFChampionEFSkill", b =>
+                {
+                    b.Property<string>("ChampionsName")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("SkillsName")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("ChampionsName", "SkillsName");
+
+                    b.HasIndex("SkillsName");
+
+                    b.ToTable("EFChampionEFSkill");
+                });
+
             modelBuilder.Entity("EFlib.EFChampion", b =>
                 {
                     b.Property<string>("Name")
@@ -86,13 +101,12 @@ namespace EFlib.Migrations
             modelBuilder.Entity("EFlib.EFSkill", b =>
                 {
                     b.Property<string>("Name")
+                        .HasMaxLength(250)
                         .HasColumnType("TEXT");
 
                     b.Property<string>("Description")
                         .IsRequired()
-                        .HasColumnType("TEXT");
-
-                    b.Property<string>("EFChampionName")
+                        .HasMaxLength(500)
                         .HasColumnType("TEXT");
 
                     b.Property<int>("Type")
@@ -100,8 +114,6 @@ namespace EFlib.Migrations
 
                     b.HasKey("Name");
 
-                    b.HasIndex("EFChampionName");
-
                     b.ToTable("Skills");
                 });
 
@@ -137,6 +149,21 @@ namespace EFlib.Migrations
                     b.ToTable("Skins");
                 });
 
+            modelBuilder.Entity("EFChampionEFSkill", b =>
+                {
+                    b.HasOne("EFlib.EFChampion", null)
+                        .WithMany()
+                        .HasForeignKey("ChampionsName")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("EFlib.EFSkill", null)
+                        .WithMany()
+                        .HasForeignKey("SkillsName")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
             modelBuilder.Entity("EFlib.EFChampion", b =>
                 {
                     b.HasOne("EFlib.EFLargeImage", "Image")
@@ -159,13 +186,6 @@ namespace EFlib.Migrations
                     b.Navigation("Champion");
                 });
 
-            modelBuilder.Entity("EFlib.EFSkill", b =>
-                {
-                    b.HasOne("EFlib.EFChampion", null)
-                        .WithMany("Skills")
-                        .HasForeignKey("EFChampionName");
-                });
-
             modelBuilder.Entity("EFlib.EFSkin", b =>
                 {
                     b.HasOne("EFlib.EFLargeImage", "Image")
@@ -189,8 +209,6 @@ namespace EFlib.Migrations
                 {
                     b.Navigation("Characteristics");
 
-                    b.Navigation("Skills");
-
                     b.Navigation("Skins");
                 });
 #pragma warning restore 612, 618
diff --git a/Sources/EFlib/Migrations/20230322115837_myMigration.cs b/Sources/EFlib/Migrations/20230322184745_myMigration.cs
similarity index 80%
rename from Sources/EFlib/Migrations/20230322115837_myMigration.cs
rename to Sources/EFlib/Migrations/20230322184745_myMigration.cs
index bbc31f9..be12fa3 100644
--- a/Sources/EFlib/Migrations/20230322115837_myMigration.cs
+++ b/Sources/EFlib/Migrations/20230322184745_myMigration.cs
@@ -23,6 +23,19 @@ namespace EFlib.Migrations
                     table.PrimaryKey("PK_LargeImages", x => x.Id);
                 });
 
+            migrationBuilder.CreateTable(
+                name: "Skills",
+                columns: table => new
+                {
+                    Name = table.Column<string>(type: "TEXT", maxLength: 250, nullable: false),
+                    Description = table.Column<string>(type: "TEXT", maxLength: 500, nullable: false),
+                    Type = table.Column<int>(type: "INTEGER", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Skills", x => x.Name);
+                });
+
             migrationBuilder.CreateTable(
                 name: "Champions",
                 columns: table => new
@@ -64,22 +77,27 @@ namespace EFlib.Migrations
                 });
 
             migrationBuilder.CreateTable(
-                name: "Skills",
+                name: "EFChampionEFSkill",
                 columns: table => new
                 {
-                    Name = table.Column<string>(type: "TEXT", nullable: false),
-                    Description = table.Column<string>(type: "TEXT", nullable: false),
-                    Type = table.Column<int>(type: "INTEGER", nullable: false),
-                    EFChampionName = table.Column<string>(type: "TEXT", nullable: true)
+                    ChampionsName = table.Column<string>(type: "TEXT", nullable: false),
+                    SkillsName = table.Column<string>(type: "TEXT", nullable: false)
                 },
                 constraints: table =>
                 {
-                    table.PrimaryKey("PK_Skills", x => x.Name);
+                    table.PrimaryKey("PK_EFChampionEFSkill", x => new { x.ChampionsName, x.SkillsName });
                     table.ForeignKey(
-                        name: "FK_Skills_Champions_EFChampionName",
-                        column: x => x.EFChampionName,
+                        name: "FK_EFChampionEFSkill_Champions_ChampionsName",
+                        column: x => x.ChampionsName,
                         principalTable: "Champions",
-                        principalColumn: "Name");
+                        principalColumn: "Name",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_EFChampionEFSkill_Skills_SkillsName",
+                        column: x => x.SkillsName,
+                        principalTable: "Skills",
+                        principalColumn: "Name",
+                        onDelete: ReferentialAction.Cascade);
                 });
 
             migrationBuilder.CreateTable(
@@ -121,9 +139,9 @@ namespace EFlib.Migrations
                 column: "NameChampion");
 
             migrationBuilder.CreateIndex(
-                name: "IX_Skills_EFChampionName",
-                table: "Skills",
-                column: "EFChampionName");
+                name: "IX_EFChampionEFSkill_SkillsName",
+                table: "EFChampionEFSkill",
+                column: "SkillsName");
 
             migrationBuilder.CreateIndex(
                 name: "IX_Skins_ImageId",
@@ -143,11 +161,14 @@ namespace EFlib.Migrations
                 name: "Characteristics");
 
             migrationBuilder.DropTable(
-                name: "Skills");
+                name: "EFChampionEFSkill");
 
             migrationBuilder.DropTable(
                 name: "Skins");
 
+            migrationBuilder.DropTable(
+                name: "Skills");
+
             migrationBuilder.DropTable(
                 name: "Champions");
 
diff --git a/Sources/EFlib/Migrations/SQLiteContextModelSnapshot.cs b/Sources/EFlib/Migrations/SQLiteContextModelSnapshot.cs
index 1e48e5f..4fed84a 100644
--- a/Sources/EFlib/Migrations/SQLiteContextModelSnapshot.cs
+++ b/Sources/EFlib/Migrations/SQLiteContextModelSnapshot.cs
@@ -17,6 +17,21 @@ namespace EFlib.Migrations
 #pragma warning disable 612, 618
             modelBuilder.HasAnnotation("ProductVersion", "7.0.2");
 
+            modelBuilder.Entity("EFChampionEFSkill", b =>
+                {
+                    b.Property<string>("ChampionsName")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("SkillsName")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("ChampionsName", "SkillsName");
+
+                    b.HasIndex("SkillsName");
+
+                    b.ToTable("EFChampionEFSkill");
+                });
+
             modelBuilder.Entity("EFlib.EFChampion", b =>
                 {
                     b.Property<string>("Name")
@@ -83,13 +98,12 @@ namespace EFlib.Migrations
             modelBuilder.Entity("EFlib.EFSkill", b =>
                 {
                     b.Property<string>("Name")
+                        .HasMaxLength(250)
                         .HasColumnType("TEXT");
 
                     b.Property<string>("Description")
                         .IsRequired()
-                        .HasColumnType("TEXT");
-
-                    b.Property<string>("EFChampionName")
+                        .HasMaxLength(500)
                         .HasColumnType("TEXT");
 
                     b.Property<int>("Type")
@@ -97,8 +111,6 @@ namespace EFlib.Migrations
 
                     b.HasKey("Name");
 
-                    b.HasIndex("EFChampionName");
-
                     b.ToTable("Skills");
                 });
 
@@ -134,6 +146,21 @@ namespace EFlib.Migrations
                     b.ToTable("Skins");
                 });
 
+            modelBuilder.Entity("EFChampionEFSkill", b =>
+                {
+                    b.HasOne("EFlib.EFChampion", null)
+                        .WithMany()
+                        .HasForeignKey("ChampionsName")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("EFlib.EFSkill", null)
+                        .WithMany()
+                        .HasForeignKey("SkillsName")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
             modelBuilder.Entity("EFlib.EFChampion", b =>
                 {
                     b.HasOne("EFlib.EFLargeImage", "Image")
@@ -156,13 +183,6 @@ namespace EFlib.Migrations
                     b.Navigation("Champion");
                 });
 
-            modelBuilder.Entity("EFlib.EFSkill", b =>
-                {
-                    b.HasOne("EFlib.EFChampion", null)
-                        .WithMany("Skills")
-                        .HasForeignKey("EFChampionName");
-                });
-
             modelBuilder.Entity("EFlib.EFSkin", b =>
                 {
                     b.HasOne("EFlib.EFLargeImage", "Image")
@@ -186,8 +206,6 @@ namespace EFlib.Migrations
                 {
                     b.Navigation("Characteristics");
 
-                    b.Navigation("Skills");
-
                     b.Navigation("Skins");
                 });
 #pragma warning restore 612, 618
diff --git a/Sources/EFlib/projet.dbloulou.db b/Sources/EFlib/projet.dbloulou.db
index 743b296..3b71c78 100644
Binary files a/Sources/EFlib/projet.dbloulou.db and b/Sources/EFlib/projet.dbloulou.db differ