From 297276dcc3e3f17f1e84f47502753a537dceb744 Mon Sep 17 00:00:00 2001
From: alexalexmax <149889301+alexalexmax@users.noreply.github.com>
Date: Tue, 13 Jan 2026 08:30:53 -0500
Subject: [PATCH] Adds EMP Resistance component, gives it to ninja suit and
 headset (#42334)

* add comp and apply to ninja gear

* cleanup

* requested changes

---------

Co-authored-by: seanpimble <149889301+seanpimble@users.noreply.github.com>
---
 Content.Shared/Emp/EmpResistanceComponent.cs  | 18 ++++++++++++++++
 Content.Shared/Emp/SharedEmpSystem.cs         | 21 +++++++++++++++++++
 .../Ninja/Systems/SharedNinjaSuitSystem.cs    |  8 -------
 .../Entities/Clothing/Ears/headsets.yml       |  2 ++
 .../Entities/Clothing/OuterClothing/suits.yml |  2 ++
 5 files changed, 43 insertions(+), 8 deletions(-)
 create mode 100644 Content.Shared/Emp/EmpResistanceComponent.cs

diff --git a/Content.Shared/Emp/EmpResistanceComponent.cs b/Content.Shared/Emp/EmpResistanceComponent.cs
new file mode 100644
index 0000000000..0768ad744f
--- /dev/null
+++ b/Content.Shared/Emp/EmpResistanceComponent.cs
@@ -0,0 +1,18 @@
+using Content.Shared.FixedPoint;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Emp;
+
+/// <summary>
+/// An entity with this component resists or is fully immune to EMPs.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+[Access(typeof(SharedEmpSystem))]
+public sealed partial class EmpResistanceComponent : Component
+{
+    /// <summary>
+    ///     The proportion of the EMP effect that is resisted. 1.00 indicates full immunity while 0.00 indicates no resistance.
+    /// </summary>
+    [DataField, AutoNetworkedField]
+    public FixedPoint2 Resistance = FixedPoint2.Zero;
+}
diff --git a/Content.Shared/Emp/SharedEmpSystem.cs b/Content.Shared/Emp/SharedEmpSystem.cs
index 4b806ab153..22457e2d6e 100644
--- a/Content.Shared/Emp/SharedEmpSystem.cs
+++ b/Content.Shared/Emp/SharedEmpSystem.cs
@@ -11,6 +11,7 @@ using Robust.Shared.GameStates;
 using Robust.Shared.Configuration; // Frontier
 using Robust.Shared;
 using Content.Shared.Damage; // Frontier
+using Robust.Shared.Utility;
 
 namespace Content.Shared.Emp;
 
@@ -39,6 +40,9 @@ public abstract class SharedEmpSystem : EntitySystem
         SubscribeLocalEvent<EmpDisabledComponent, ExaminedEvent>(OnExamine);
         SubscribeLocalEvent<EmpDisabledComponent, ComponentRemove>(OnRemove);
         SubscribeLocalEvent<EmpDisabledComponent, RejuvenateEvent>(OnRejuvenate);
+
+        SubscribeLocalEvent<EmpResistanceComponent, EmpAttemptEvent>(OnResistEmpAttempt);
+        SubscribeLocalEvent<EmpResistanceComponent, EmpPulseEvent>(OnResistEmpPulse);
     }
 
     public static readonly EntProtoId EmpPulseEffectPrototype = "EffectEmpBlast"; // Frontier - was EffectEmpPulse
@@ -192,6 +196,23 @@ public abstract class SharedEmpSystem : EntitySystem
     {
         RemCompDeferred<EmpDisabledComponent>(ent);
     }
+
+    private void OnResistEmpAttempt(Entity<EmpResistanceComponent> ent, ref EmpAttemptEvent args)
+    {
+        if (ent.Comp.Resistance >= 1)
+            args.Cancelled = true;
+    }
+
+    private void OnResistEmpPulse(Entity<EmpResistanceComponent> ent, ref EmpPulseEvent args)
+    {
+        var empStrengthMultiplier = 1 - ent.Comp.Resistance;
+
+        if (empStrengthMultiplier <= 0)
+            return;
+
+        args.Duration *= (float) empStrengthMultiplier;
+        args.EnergyConsumption *= (float) empStrengthMultiplier;
+    }
 }
 
 /// <summary>
diff --git a/Content.Shared/Ninja/Systems/SharedNinjaSuitSystem.cs b/Content.Shared/Ninja/Systems/SharedNinjaSuitSystem.cs
index 69627badd1..a5455c6158 100644
--- a/Content.Shared/Ninja/Systems/SharedNinjaSuitSystem.cs
+++ b/Content.Shared/Ninja/Systems/SharedNinjaSuitSystem.cs
@@ -36,7 +36,6 @@ public abstract class SharedNinjaSuitSystem : EntitySystem
         SubscribeLocalEvent<NinjaSuitComponent, CreateItemAttemptEvent>(OnCreateStarAttempt);
         SubscribeLocalEvent<NinjaSuitComponent, ItemToggleActivateAttemptEvent>(OnActivateAttempt);
         SubscribeLocalEvent<NinjaSuitComponent, GotUnequippedEvent>(OnUnequipped);
-        SubscribeLocalEvent<NinjaSuitComponent, EmpAttemptEvent>(OnEmpAttempt);
     }
 
     private void OnEquipped(Entity<NinjaSuitComponent> ent, ref ClothingGotEquippedEvent args)
@@ -178,11 +177,4 @@ public abstract class SharedNinjaSuitSystem : EntitySystem
         if (user.Comp.Gloves is { } uid)
             _toggle.TryDeactivate(uid, user: user);
     }
-
-    private void OnEmpAttempt(Entity<NinjaSuitComponent> ent, ref EmpAttemptEvent args)
-    {
-        // ninja suit (battery) is immune to emp
-        // powercell relays the event to suit
-        args.Cancelled = true;
-    }
 }
diff --git a/Resources/Prototypes/Entities/Clothing/Ears/headsets.yml b/Resources/Prototypes/Entities/Clothing/Ears/headsets.yml
index 2b7e039955..1de824388e 100644
--- a/Resources/Prototypes/Entities/Clothing/Ears/headsets.yml
+++ b/Resources/Prototypes/Entities/Clothing/Ears/headsets.yml
@@ -315,3 +315,5 @@
     sprite: Clothing/Ears/Headsets/ninja.rsi
   - type: Clothing
     sprite: Clothing/Ears/Headsets/ninja.rsi
+  - type: EmpResistance
+    resistance: 1
diff --git a/Resources/Prototypes/Entities/Clothing/OuterClothing/suits.yml b/Resources/Prototypes/Entities/Clothing/OuterClothing/suits.yml
index 7c827ec010..1d2100ee2e 100644
--- a/Resources/Prototypes/Entities/Clothing/OuterClothing/suits.yml
+++ b/Resources/Prototypes/Entities/Clothing/OuterClothing/suits.yml
@@ -249,6 +249,8 @@
     noPowerPopup: ninja-no-power
   # core ninja suit stuff
   - type: NinjaSuit
+  - type: EmpResistance
+    resistance: 1
   - type: UseDelay
     delay: 5 # disable time
   - type: PowerCellSlot