Storage items drop as a bonus roll at the end of a dungeon, on top of the normal loot. Three gates decide it:
1. Grade gate: you must finish at grade B or higher — D/C runs never drop storage.
2. Difficulty → tier: each difficulty drops one specific storage item:
3. Charm scaling: your drop chance rises with your Charm tier (Stone → Iron → Gold → Diamond).
Higher charm = better odds:
Difficulty
Reward
Stone
Iron
Gold
Diamond
Easy
Stone Chest
2.00%
2.40%
3.24%
4.86%
Medium
Iron Upgrade
1.00%
2.00%
2.40%
3.24%
Hard
Gold Upgrade
0.50%
1.00%
2.00%
2.40%
Extreme (COMING SOON)
Diamond Upgrade
0.25%
0.50%
1.00%
2.00%
Extreme (COMING SOON)
Crystal Upgrade
-
-
-
0.50%
Key points:
Crystal is the true endgame chase — only from Extreme, only with a Diamond charm, at 0.5% (~1 in 200 qualifying runs).
Progression is intentional: farm Easy for the base Stone Chest, then climb Medium→Hard→Extreme for the upgrades to grow it Stone→Iron→Gold→Diamond→Crystal.
On a hit it runs /advstorage give/giveupgrade <player> <tier> and announces: Storage drop: <item>!
This is separate from the coin/loot-pool rolls — it's its own independent chance.
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Complex Gaming Cobblemon & Pixelmon - General Guides