Add weapon data

public/data/weapons/usurpers.json

@@ -0,0 +1,17 @@
+{
+  "id": "usurpers",
+  "name": "Usurpers",
+  "atk": 272,
+  "crt": 27,
+  "rarity": 5,
+  "skills": [
+    {
+      "name": "Infrasound",
+      "description": "[SP: 15][CD: 15s] Generates infrasound waves that deal 380% ATK of Physical DMG to nearby enemies. Affected enemies are also weakened, reducing their ATK by 60% for 6.0s."
+    },
+    {
+      "name": "Light and Order",
+      "description": "Increases Ranged Physical DMG by 40%, however, the further away an enemy is, the less Physical DMG it'll receive. Damage is decreased by 10% per meter (up to 80%). Character gains 15.0% Move Speed."
+    }
+  ]
+}