Zombie disease is easier to spread and deadly in minutes. Zombies heal over time. (#16235)

* Nerf Space zombies, get DoT in space (barotrauma) and spawn stunned.

- Also discard any helmet or mask you might be wearing.

* Zombies have heal over time, infection far more fatal

- Stun time reduced to 2 seconds

* Zombification occurs after you die, rather than after you crit.

- Zombies cannot inflict Zombification DoT on other zombies.

* Heal shock damage, space zombies are back.

* Lower the chance of infection per hit

* Removed the stun, reduced zombification virus slightly

Content.Server/Zombies/PendingZombieComponent.cs

@@ -12,12 +12,18 @@ public sealed class PendingZombieComponent : Component
 {
     [DataField("damage")] public DamageSpecifier Damage = new()
     {
-        DamageDict = new Dictionary<string, FixedPoint2>()
+        DamageDict = new ()
         {
-            { "Blunt", FixedPoint2.New(1) }
+            { "Blunt", 0.5 },
+            { "Cellular", 0.2 },
+            { "Toxin", 0.2 },
         }
     };
 
     [DataField("nextTick", customTypeSerializer:typeof(TimeOffsetSerializer))]
     public TimeSpan NextTick;
+
+    // Scales damage over time.
+    [DataField("infectedSecs")]
+    public int InfectedSecs;
 }

Content.Server/Zombies/ZombieSystem.cs

@@ -63,12 +63,28 @@ namespace Content.Server.Zombies
             var query = EntityQueryEnumerator<PendingZombieComponent>();
             var curTime = _timing.CurTime;
 
+            // Hurt the living infected
             while (query.MoveNext(out var uid, out var comp))
             {
-                if (comp.NextTick < curTime)
+                if (comp.NextTick + TimeSpan.FromSeconds(1) > curTime)
                     continue;
 
-                comp.NextTick += TimeSpan.FromSeconds(1);
+                comp.InfectedSecs += 1;
+                // Pain of becoming a zombie grows over time
+                // 1x at 30s, 3x at 60s, 6x at 90s, 10x at 120s.
+                var pain_multiple = 0.1 + 0.02 * comp.InfectedSecs + 0.0005 * comp.InfectedSecs * comp.InfectedSecs;
+                comp.NextTick = curTime;
+                _damageable.TryChangeDamage(uid, comp.Damage * pain_multiple, true, false);
+            }
+
+            var zomb_query = EntityQueryEnumerator<ZombieComponent>();
+            // Heal the zombified
+            while (zomb_query.MoveNext(out var uid, out var comp))
+            {
+                if (comp.NextTick + TimeSpan.FromSeconds(1) > curTime)
+                    continue;
+
+                comp.NextTick = curTime;
                 _damageable.TryChangeDamage(uid, comp.Damage, true, false);
             }
         }
@@ -166,14 +182,18 @@ namespace Content.Server.Zombies
                 if (!TryComp<MobStateComponent>(entity, out var mobState) || HasComp<DroneComponent>(entity))
                     continue;
 
-                if (_random.Prob(GetZombieInfectionChance(entity, component)))
-                {
-                    EnsureComp<PendingZombieComponent>(entity);
-                    EnsureComp<ZombifyOnDeathComponent>(entity);
-                }
-
                 if (HasComp<ZombieComponent>(entity))
+                {
                     args.BonusDamage = -args.BaseDamage * zombieComp.OtherZombieDamageCoefficient;
+                }
+                else
+                {
+                    if (_random.Prob(GetZombieInfectionChance(entity, component)))
+                    {
+                        EnsureComp<PendingZombieComponent>(entity);
+                        EnsureComp<ZombifyOnDeathComponent>(entity);
+                    }
+                }
 
                 if ((mobState.CurrentState == MobState.Dead || mobState.CurrentState == MobState.Critical)
                     && !HasComp<ZombieComponent>(entity))

Content.Server/Zombies/ZombifyOnDeathSystem.cs

@@ -1,3 +1,4 @@
+using Content.Server.Administration.Commands;
 using Content.Server.Atmos.Components;
 using Content.Server.Body.Components;
 using Content.Server.Body.Systems;
@@ -22,6 +23,7 @@ using Content.Shared.Hands.EntitySystems;
 using Content.Shared.Humanoid;
 using Content.Shared.Mobs;
 using Content.Shared.Mobs.Components;
+using Content.Shared.Mobs.Systems;
 using Content.Shared.Movement.Components;
 using Content.Shared.Movement.Systems;
 using Content.Shared.Nutrition.Components;
@@ -54,6 +56,8 @@ namespace Content.Server.Zombies
         [Dependency] private readonly SharedCombatModeSystem _combat = default!;
         [Dependency] private readonly IChatManager _chatMan = default!;
         [Dependency] private readonly IPrototypeManager _proto = default!;
+        [Dependency] private readonly MobStateSystem _mobState = default!;
+        [Dependency] private readonly MobThresholdSystem _mobThreshold = default!;
 
         public override void Initialize()
         {
@@ -67,8 +71,7 @@ namespace Content.Server.Zombies
         /// </summary>
         private void OnDamageChanged(EntityUid uid, ZombifyOnDeathComponent component, MobStateChangedEvent args)
         {
-            if (args.NewMobState == MobState.Dead ||
+            if (args.NewMobState == MobState.Dead)
-                args.NewMobState == MobState.Critical)
             {
                 ZombifyEntity(uid, args.Component);
             }
@@ -181,10 +184,17 @@ namespace Content.Server.Zombies
             if (TryComp<TemperatureComponent>(target, out var tempComp))
                 tempComp.ColdDamage.ClampMax(0);
 
+            // Zombies can revive themselves
+            _mobThreshold.SetAllowRevives(target, true);
+
             //Heals the zombie from all the damage it took while human
             if (TryComp<DamageableComponent>(target, out var damageablecomp))
                 _damageable.SetAllDamage(target, damageablecomp, 0);
 
+            // Revive them now
+            if (TryComp<MobStateComponent>(target, out var mobstate) && mobstate.CurrentState==MobState.Dead)
+                _mobState.ChangeMobState(target, MobState.Alive, mobstate);
+
             //gives it the funny "Zombie ___" name.
             var meta = MetaData(target);
             zombiecomp.BeforeZombifiedEntityName = meta.EntityName;
@@ -221,6 +231,8 @@ namespace Content.Server.Zombies
                 _sharedHands.RemoveHand(target, hand.Name);
             }
             RemComp<HandsComponent>(target);
+            // No longer waiting to become a zombie:
+            RemComp<PendingZombieComponent>(target);
 
             //zombie gamemode stuff
             RaiseLocalEvent(new EntityZombifiedEvent(target));

Content.Shared/Zombies/ZombieComponent.cs

@@ -1,8 +1,10 @@
 using Content.Shared.Chat.Prototypes;
+using Content.Shared.Damage;
 using Content.Shared.Roles;
 using Content.Shared.Humanoid;
 using Robust.Shared.GameStates;
 using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;
 using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
 using static Content.Shared.Humanoid.HumanoidAppearanceState;
 
@@ -22,14 +24,14 @@ namespace Content.Shared.Zombies
         /// The baseline infection chance you have if you are completely nude
         /// </summary>
         [ViewVariables(VVAccess.ReadWrite)]
-        public float MaxZombieInfectionChance = 0.50f;
+        public float MaxZombieInfectionChance = 0.40f;
 
         /// <summary>
         /// The minimum infection chance possible. This is simply to prevent
         /// being invincible by bundling up.
         /// </summary>
         [ViewVariables(VVAccess.ReadWrite)]
-        public float MinZombieInfectionChance = 0.05f;
+        public float MinZombieInfectionChance = 0.10f;
 
         [ViewVariables(VVAccess.ReadWrite)]
         public float ZombieMovementSpeedDebuff = 0.75f;
@@ -86,5 +88,21 @@ namespace Content.Shared.Zombies
         public string? EmoteSoundsId = "Zombie";
 
         public EmoteSoundsPrototype? EmoteSounds;
+
+        // Heal on tick
+        [DataField("nextTick", customTypeSerializer:typeof(TimeOffsetSerializer))]
+        public TimeSpan NextTick;
+
+        [DataField("damage")] public DamageSpecifier Damage = new()
+        {
+            DamageDict = new ()
+            {
+                { "Blunt", -0.3 },
+                { "Slash", -0.2 },
+                { "Heat", -0.2 },
+                { "Cold", -0.2 },
+                { "Shock", -0.2 },
+            }
+        };
     }
 }