diff --git a/Resources/Locale/en-US/_Harmony/store/uplink-catalog.ftl b/Resources/Locale/en-US/_Harmony/store/uplink-catalog.ftl
index 1c5b9aad0ea19..0bcbc232f3aee 100644
--- a/Resources/Locale/en-US/_Harmony/store/uplink-catalog.ftl
+++ b/Resources/Locale/en-US/_Harmony/store/uplink-catalog.ftl
@@ -14,6 +14,12 @@ uplink-pizza-bomb-desc = This tech, first pioneered by terrorists, now is used b
 uplink-pizza-bomb-surplus-name = Surplus Pizza Bomb
 uplink-pizza--surplus-desc = This shouldn't be visible, report me.
 
+uplink-X4-name = X-4
+uplink-X4-desc = The cousin of the infamous C-4, uses experimental explosives to better pierce through structures.
+
+uplink-X4-bundle-name = X-4 Bundle
+uplink-X4-bundle-desc = A bag containing 4 X-4s, perfect for going all in on sabotage.
+
 # Ammo
 
 uplink-blood-red-carbine-ammo-name = Jailbroken Energy Cartridge
diff --git a/Resources/Prototypes/Entities/Objects/Weapons/Bombs/plastic.yml b/Resources/Prototypes/Entities/Objects/Weapons/Bombs/plastic.yml
index 761e6513d4b59..57d5d93d9590e 100644
--- a/Resources/Prototypes/Entities/Objects/Weapons/Bombs/plastic.yml
+++ b/Resources/Prototypes/Entities/Objects/Weapons/Bombs/plastic.yml
@@ -67,9 +67,11 @@
     - Timer
   - type: Explosive # Powerful explosion in a very small radius. Doesn't break underplating.
     explosionType: DemolitionCharge
-    totalIntensity: 60
+    # Harmony Start
+    totalIntensity: 5 # 60 -> 5
     intensitySlope: 5
-    maxIntensity: 30
+    maxIntensity: 15 # 30 - 15
+    # Harmony End
     canCreateVacuum: false
   - type: ExplodeOnTrigger
   - type: HolidayVisuals
diff --git a/Resources/Prototypes/_Harmony/Catalog/Fills/Backpacks/duffelbag.yml b/Resources/Prototypes/_Harmony/Catalog/Fills/Backpacks/duffelbag.yml
index 5d4fba69ecc17..170c7f522e44a 100644
--- a/Resources/Prototypes/_Harmony/Catalog/Fills/Backpacks/duffelbag.yml
+++ b/Resources/Prototypes/_Harmony/Catalog/Fills/Backpacks/duffelbag.yml
@@ -1,3 +1,15 @@
+- type: entity
+  parent: ClothingBackpackDuffelSyndicateBundle
+  id: ClothingBackpackDuffelSyndicateX4Bundle
+  name: syndicate X-4 bundle
+  suffix: Harmony
+  description: Contains a lot of X-4 charges.
+  components:
+  - type: StorageFill
+    contents:
+    - id: X4
+      amount: 4
+
 - type: entity
   parent: ClothingBackpackDuffelSyndicateBundle
   id: ClothingBackpackDuffelSyndicateFilledBloodRedEnergyCarbineHarmony
diff --git a/Resources/Prototypes/_Harmony/Catalog/uplink_catalog.yml b/Resources/Prototypes/_Harmony/Catalog/uplink_catalog.yml
index c3025c77b0fb3..9c393e5c70c2e 100644
--- a/Resources/Prototypes/_Harmony/Catalog/uplink_catalog.yml
+++ b/Resources/Prototypes/_Harmony/Catalog/uplink_catalog.yml
@@ -75,7 +75,39 @@
     whitelist:
       components:
       - SurplusBundle
+  
+- type: listing
+  id: UplinkX4
+  name: uplink-X4-name
+  description: uplink-X4-desc
+  productEntity: X4
+  discountCategory: usualDiscounts
+  discountDownTo:
+    Telecrystal: 2
+  cost:
+    Telecrystal: 4
+  categories:
+  - UplinkExplosives
+  conditions:
+  - !type:StoreWhitelistCondition
+    whitelist:
+      tags:
+      - NukeOpsUplink
 
+- type: listing
+  id: UplinkX4Bundle
+  name: uplink-X4-bundle-name
+  description: uplink-X4-bundle-desc
+  productEntity: ClothingBackpackDuffelSyndicateX4Bundle
+  cost:
+    Telecrystal: 14
+  categories:
+  - UplinkExplosives
+  conditions:
+  - !type:StoreWhitelistCondition
+    whitelist:
+      tags:
+      - NukeOpsUplink
 
 # Ammo
 
diff --git a/Resources/Prototypes/_Harmony/Entities/Objects/Weapons/Bombs/plastic.yml b/Resources/Prototypes/_Harmony/Entities/Objects/Weapons/Bombs/plastic.yml
new file mode 100644
index 0000000000000..d309b715b42b0
--- /dev/null
+++ b/Resources/Prototypes/_Harmony/Entities/Objects/Weapons/Bombs/plastic.yml
@@ -0,0 +1,22 @@
+- type: entity
+  parent: C4
+  id: X4
+  name: composition X-4
+  suffix: Harmony
+  description: A new prototype of explosive, meant to rival a popular tool for saboteurs, C4.
+  components:
+  - type: Sprite
+    sprite: _Harmony/Objects/Weapons/Bombs/X-4.rsi
+    state: icon
+    layers:
+    - state: icon
+      map: ["base"]
+    quickEquip: false
+  - type: Explosive
+    explosionType: DemolitionCharge
+    totalIntensity: 60
+    intensitySlope: 5
+    maxIntensity: 30
+    canCreateVacuum: false
+  - type: OnUseTimerTrigger
+    beepSound: /Audio/Machines/Nuke/angry_beep.ogg
diff --git a/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/icon.png b/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/icon.png
new file mode 100644
index 0000000000000..e23df0c02b8ae
Binary files /dev/null and b/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/icon.png differ
diff --git a/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/inhand-left.png b/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/inhand-left.png
new file mode 100644
index 0000000000000..cd90377794f28
Binary files /dev/null and b/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/inhand-left.png differ
diff --git a/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/inhand-right.png b/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/inhand-right.png
new file mode 100644
index 0000000000000..e4d4266a42746
Binary files /dev/null and b/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/inhand-right.png differ
diff --git a/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/meta.json b/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/meta.json
new file mode 100644
index 0000000000000..a4ceeb8446b19
--- /dev/null
+++ b/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/meta.json
@@ -0,0 +1,31 @@
+{
+    "version": 1,
+    "license": "CC-BY-SA-3.0",
+    "copyright": "Taken from tgstation at https://github.com/tgstation/tgstation/pull/31549/commits/4b457ca39d21d09a1211ed9c7de44681284e3778",
+    "size": {
+        "x": 32,
+        "y": 32
+    },
+    "states": [
+        {
+            "name": "icon"
+        },
+        {
+            "name": "primed",
+            "delays": [
+                [
+                    0.1,
+                    0.1
+                ]
+            ]
+        },
+        {
+            "name": "inhand-left",
+            "directions": 4
+        },
+        {
+            "name": "inhand-right",
+            "directions": 4
+        }
+    ]
+}
diff --git a/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/primed.png b/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/primed.png
new file mode 100644
index 0000000000000..5c5d9cf1a69f4
Binary files /dev/null and b/Resources/Textures/_Harmony/Objects/Weapons/Bombs/X-4.rsi/primed.png differ