Natural immunities (#9026)

Content.Server/Disease/Components/DiseaseCarrierComponent.cs

@@ -44,5 +44,13 @@ namespace Content.Server.Disease.Components
         /// </summary>
         [ViewVariables, DataField("carrierDiseases", customTypeSerializer: typeof(PrototypeIdHashSetSerializer<DiseasePrototype>))]
         public HashSet<string>? CarrierDiseases;
+
+        /// <summary>
+        /// When this component is initialized,
+        /// these diseases will be added to past diseases,
+        /// rendering them immune.
+        /// </summary>
+        [DataField("naturalImmunities")]
+        public List<string>? NaturalImmunities;
     }
 }

Content.Server/Disease/DiseaseSystem.cs

@@ -39,6 +39,7 @@ namespace Content.Server.Disease
         public override void Initialize()
         {
             base.Initialize();
+            SubscribeLocalEvent<DiseaseCarrierComponent, ComponentInit>(OnInit);
             SubscribeLocalEvent<DiseaseCarrierComponent, CureDiseaseAttemptEvent>(OnTryCureDisease);
             SubscribeLocalEvent<DiseasedComponent, InteractHandEvent>(OnInteractDiseasedHand);
             SubscribeLocalEvent<DiseasedComponent, InteractUsingEvent>(OnInteractDiseasedUsing);
@@ -127,6 +128,25 @@ namespace Content.Server.Disease
         /// Event Handlers
         ///
 
+        /// <summary>
+        /// Fill in the natural immunities of this entity.
+        /// </summary>
+        private void OnInit(EntityUid uid, DiseaseCarrierComponent component, ComponentInit args)
+        {
+            if (component.NaturalImmunities == null || component.NaturalImmunities.Count == 0)
+                return;
+
+            foreach (var immunity in component.NaturalImmunities)
+            {
+                if (_prototypeManager.TryIndex<DiseasePrototype>(immunity, out var disease))
+                    component.PastDiseases.Add(disease);
+                else
+                {
+                    Logger.Error("Failed to index disease prototype + " + immunity + " for " + uid);
+                }
+            }
+        }
+
         /// <summary>
         /// Used when something is trying to cure ANY disease on the target,
         /// not for special disease interactions. Randomly

Resources/Prototypes/Damage/modifier_sets.yml

@@ -86,6 +86,7 @@
     Piercing: 1.2
     Cold: 1.5
     Poison: 0.8
+    Cellular: 0.2
 
 - type: damageModifierSet
   id: Infernal

Resources/Prototypes/Entities/Mobs/Species/slime.yml

@@ -155,6 +155,10 @@
       types:
         Asphyxiation: -1.0
     maxSaturation: 15
+  - type: DiseaseCarrier
+    naturalImmunities:
+    - Ultragigacancer
+    - BleedersBite
 
 - type: entity
   save: false