The mana randomisation is one of 14 chaotic effects; they trigger one in five times when hit by a chaos spell, and one in ten when hit by a weapon of Chaos in melee.
Rune of mana drains a flat 20 mana (same as mana burn). For reference, a novice mage has 40 mana, Mim has 72, Vecna has 185.
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One for the Dark Lord on his dark throne
In the Land of Mordor where the Shadows lie.
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