Underground Challenge Utilities: Octu (by Hume2)
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This mod is similar Octupuslegs's mod. Octupuslegs's "octumese" mod is a crime
against humanity, so I didn't use neither code or textures from it.

License:
* code: MIT
* textures: CC-BY-SA 3.0 (derived from: LionLAD)

This mod adds octu crystals which can be crafted from mese and sapphires. Octu crystals can be used for crafting more durable tools.
