diff --git a/src/main/java/uulm/teamname/marvelous/gamelibrary/entities/Entity.java b/src/main/java/uulm/teamname/marvelous/gamelibrary/entities/Entity.java
index 256a8a0..9f77fe5 100644
--- a/src/main/java/uulm/teamname/marvelous/gamelibrary/entities/Entity.java
+++ b/src/main/java/uulm/teamname/marvelous/gamelibrary/entities/Entity.java
@@ -1,13 +1,16 @@
 package uulm.teamname.marvelous.gamelibrary.entities;
 
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 import uulm.teamname.marvelous.gamelibrary.IntVector2;
 import uulm.teamname.marvelous.gamelibrary.json.ingame.deserialize.EntityDeserializer;
+import uulm.teamname.marvelous.gamelibrary.json.ingame.serialize.EntitySerializer;
 
 import java.util.Objects;
 
 /** Represents an abstract entity. */
 @JsonDeserialize(using = EntityDeserializer.class)
+@JsonSerialize(using = EntitySerializer.class)
 public abstract class Entity {
     /** Whether or not the entity is currently active in the game */
     protected boolean active = true;
diff --git a/src/main/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializer.java b/src/main/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializer.java
new file mode 100644
index 0000000..3cb6081
--- /dev/null
+++ b/src/main/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializer.java
@@ -0,0 +1,77 @@
+package uulm.teamname.marvelous.gamelibrary.json.ingame.serialize;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.ser.std.StdSerializer;
+import uulm.teamname.marvelous.gamelibrary.entities.*;
+import uulm.teamname.marvelous.gamelibrary.entities.Character;
+import uulm.teamname.marvelous.gamelibrary.json.ingame.SerializedEntityType;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+public class EntitySerializer extends StdSerializer<Entity> {
+    public EntitySerializer() {
+        this(null);
+    }
+
+    protected EntitySerializer(Class<Entity> t) {
+        super(t);
+    }
+
+    @Override
+    public void serialize(Entity value, JsonGenerator gen, SerializerProvider provider) throws IOException {
+        gen.writeStartObject();
+        gen.writeObjectField("entityType", SerializedEntityType.valueOf(value.id.type));
+
+        if (value instanceof NPC) {
+            System.out.println("instanceof NPC");
+            serializeNPC((NPC) value, gen, provider);
+        } else if (value instanceof Character) {
+            System.out.println("instanceof Chara");
+            serializeCharacter((Character) value, gen, provider);
+        } else if (value instanceof Rock) {
+            serializeRock((Rock) value, gen, provider);
+        } else if (value instanceof InfinityStone) {
+            serializeInfinityStone((InfinityStone) value, gen, provider);
+        }
+
+        gen.writeObjectField("position", value.getPosition());
+        gen.writeEndObject();
+    }
+
+    private void serializeNPC(NPC value, JsonGenerator gen, SerializerProvider provider)
+            throws IOException {
+        gen.writeNumberField("ID", value.id.id);
+        // gen.writeNumberField("MP",value.MP); // TODO: Doesn't exist yet?
+//        gen.writeArray(value.); // TODO: Put values here
+    }
+
+    private void serializeCharacter(Character value, JsonGenerator gen, SerializerProvider provider)
+            throws IOException {
+        gen.writeNumberField("PID", value.id.type == EntityType.P1 ? 1 : 2);
+        gen.writeNumberField("ID", value.id.id);
+        gen.writeNumberField("HP", value.hp.getValue());
+        gen.writeNumberField("MP", value.mp.getValue());
+        gen.writeNumberField("AP", value.ap.getValue());
+
+        gen.writeFieldName("stones");
+        gen.writeArray(
+                Arrays.stream(value.inventory.getStonesAsArray())
+                        .mapToInt(StoneType::getID)
+                        .sorted()
+                        .toArray(),
+                0, value.inventory.getSize());
+    }
+
+    private void serializeRock(Rock value, JsonGenerator gen, SerializerProvider provider)
+            throws IOException {
+        gen.writeNumberField("ID", value.id.id);
+        gen.writeNumberField("HP", value.getHp());
+    }
+
+    private void serializeInfinityStone(InfinityStone value, JsonGenerator gen, SerializerProvider provider)
+            throws IOException {
+        gen.writeNumberField("ID", value.id.id);
+    }
+}
diff --git a/src/test/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializerTest.java b/src/test/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializerTest.java
new file mode 100644
index 0000000..5aa6309
--- /dev/null
+++ b/src/test/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializerTest.java
@@ -0,0 +1,43 @@
+package uulm.teamname.marvelous.gamelibrary.json.ingame.serialize;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+import uulm.teamname.marvelous.gamelibrary.IntVector2;
+import uulm.teamname.marvelous.gamelibrary.entities.Character;
+import uulm.teamname.marvelous.gamelibrary.entities.EntityID;
+import uulm.teamname.marvelous.gamelibrary.entities.EntityType;
+import uulm.teamname.marvelous.gamelibrary.entities.StoneType;
+import uulm.teamname.marvelous.gamelibrary.json.ingame.deserialize.EntityDeserializer;
+
+import static org.mockito.Mockito.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+class EntitySerializerTest {
+
+
+    @Test
+    void notATestJustSomethingToRun() throws JsonProcessingException {
+        var mapper = new ObjectMapper();
+
+        var chara = new Character(
+                new EntityID(EntityType.P2, 3),
+                new IntVector2(12, 24),
+                "CoolHeroThing",
+                200,
+                300,
+                400,
+                500,
+                600,
+                700);
+
+        chara.inventory.addStone(StoneType.SoulStone);
+        chara.inventory.addStone(StoneType.SpaceStone);
+        chara.inventory.addStone(StoneType.MindStone);
+
+        var result = mapper.writeValueAsString(chara);
+
+        System.out.println(result);
+    }
+
+}
\ No newline at end of file