Fix nymphs being deleted immediatly after spawning (#25344)

* nymphs now don't get deleted together with the body of the diona

* moved nymph system to server

Content.Server/Species/Systems/NymphSystem.cs

@@ -0,0 +1,41 @@
+using Content.Server.Mind;
+using Content.Shared.Species.Components;
+using Content.Shared.Body.Events;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Timing;
+
+namespace Content.Server.Species.Systems;
+
+public sealed partial class NymphSystem : EntitySystem
+{
+    [Dependency] private readonly IPrototypeManager _protoManager= default!;
+    [Dependency] private readonly MindSystem _mindSystem = default!;
+    [Dependency] private readonly IGameTiming _timing = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<NymphComponent, RemovedFromPartInBodyEvent>(OnRemovedFromPart);
+    }
+
+    private void OnRemovedFromPart(EntityUid uid, NymphComponent comp, RemovedFromPartInBodyEvent args)
+    {
+        if (!_timing.IsFirstTimePredicted)
+            return;
+
+        if (TerminatingOrDeleted(uid) || TerminatingOrDeleted(args.OldBody))
+            return;
+
+        if (!_protoManager.TryIndex<EntityPrototype>(comp.EntityPrototype, out var entityProto))
+            return;
+
+        var coords = Transform(uid).Coordinates;
+        var nymph = EntityManager.SpawnAtPosition(entityProto.ID, coords);
+
+        if (comp.TransferMind == true && _mindSystem.TryGetMind(args.OldBody, out var mindId, out var mind))
+            _mindSystem.TransferTo(mindId, nymph, mind: mind);
+
+        QueueDel(uid);
+    }
+}