diff --git a/items/THORN_BOSS.json b/items/THORN_BOSS.json
index 8d25121c9..21b90b6fd 100644
--- a/items/THORN_BOSS.json
+++ b/items/THORN_BOSS.json
@@ -103,7 +103,7 @@
       "drops": [
         {
           "id": "SPIRIT_BONE",
-          "chance": "2.740%",
+          "chance": "2.7304%",
           "extra": [
             "§e§lFound in: §5Obsidian Chest",
             "§e§lChest Price: §61,500,000 coins"
@@ -111,7 +111,7 @@
         },
         {
           "id": "SPIRIT_WING",
-          "chance": "2.740%",
+          "chance": "2.7304%",
           "extra": [
             "§e§lFound in: §5Obsidian Chest",
             "§e§lChest Price: §62,000,000 coins"
@@ -119,7 +119,7 @@
         },
         {
           "id": "THORNS_BOOTS",
-          "chance": "1.370%",
+          "chance": "1.3652%",
           "extra": [
             "§e§lFound in: §5Obsidian Chest",
             "§e§lChest Price: §64,000,000 coins"
@@ -127,7 +127,7 @@
         },
         {
           "id": "SPIRIT_SWORD",
-          "chance": "1.370%",
+          "chance": "1.3652%",
           "extra": [
             "§e§lFound in: §5Obsidian Chest",
             "§e§lChest Price: §63,000,000 coins"
@@ -135,7 +135,7 @@
         },
         {
           "id": "ITEM_SPIRIT_BOW",
-          "chance": "1.370%",
+          "chance": "1.3652%",
           "extra": [
             "§e§lFound in: §5Obsidian Chest",
             "§e§lChest Price: §64,000,000 coins"
@@ -151,7 +151,7 @@
         },
         {
           "id": "SPIRIT;4",
-          "chance": "1.370%",
+          "chance": "1.3652%",
           "extra": [
             "§e§lFound in: §5Obsidian Chest",
             "§e§lChest Price: §61,000,000 coins"
@@ -159,7 +159,7 @@
         },
         {
           "id": "SPIRIT_DECOY",
-          "chance": "2.740%",
+          "chance": "2.7304%",
           "extra": [
             "§e§lFound in: §5Obsidian Chest",
             "§e§lChest Price: §61,500,000 coins"
@@ -167,7 +167,7 @@
         },
         {
           "id": "SECOND_MASTER_STAR",
-          "chance": "2.740%",
+          "chance": "2.7304%",
           "extra": [
             "§e§lFound in: §5Obsidian Chest",
             "§e§lChest Price: §66,000,000 coins"
@@ -175,11 +175,19 @@
         },
         {
           "id": "MASTER_SKULL_TIER_3",
-          "chance": "4.110%",
+          "chance": "4.0956%",
           "extra": [
             "§e§lFound in: §5Obsidian Chest",
             "§e§lChest Price: §62,000,000 coins"
           ]
+        },
+        {
+          "id": "SPIRIT_MASK",
+          "chance": "0.3413%",
+          "extra": [
+            "§e§lFound in: §5Obsidian Chest",
+            "§e§lChest Price: §615,000,000 coins"
+          ]
         }
       ]
     }