Before the Storm event existed, prop started a throwaway Forge 1.20.1 server on 28 April 2024 to try out Cracker’s Wither Storm mod. 1
With the mod installed there is always a structure at 0, 0, the spot where the Wither is summoned. 2 Kit chests handed out gear that spawned Unbreakable. 3 The test server later became the Axolotl Storm event server, with the Cracker's Wither Storm Mod at its centre.

Pictures
Primary sources
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Server Started!
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ProPlayerPlayz: with this mod there is always a structure at 0 \~ 0
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ProPlayerPlayz: items in chest are spawned in Unbreakable
