Nanaya's Torch has absolutely bonkers madness buildup

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Been playing around in the arena with the madness bottles on one hand and the torch on another, and I swear this thing's ash of war builds up madness faster than any other incantation or ash of war in the game.

Can anyone else double check this?

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Watched a few videos, and I managed to find this:

https://www.youtube.com/watch?v=LUSYxS6ROdY