Chaos-runes are the catalyst rune for medium level magic spells — specifically bolt spells and crumble undead. They are dropped by monsters.

They are used in these spells:

Spell Level Runes needed
Wind bolt 17 2 air-runes, 1 chaos-rune
Water bolt 23 2 water-runes, 2 air-runes, 1 chaos-rune
Earth bolt 29 3 earth-runes, 2 air-runes, 1 chaos-rune
Fire bolt 35 4 fire-runes, 3 air-runes, 1 chaos-rune
Crumble undead 39 2 earth-runes, 2 air-runes, 1 chaos-rune

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