It did not occurred to me until you mentioned it, but indeed the amount of blackspace you get with Troll Brain combined
with the free DP (and knockback for self-cannon in certain specific cases) makes Apheelsick a very powerful glyph for the Troll... Especially when you have double mana thanks to Shado Heart.
Since Troll Brain trigger as soon as you take strictly more damage than what you regen, I'm wondering if it couldn't be possible to get an infinite amount of blackspace by regenerating X per tile, and getting hit by an enemy that deals X+1.
That way, for each 1 health spent, you get one blackspace. If you combine that with Halpmeh you can compensate that health loss.
The main difficulty becomes finding enemies that deals X+1, and having enough of them so that they can regenerate sufficiently to fuel the loop.
It couldn't be used for much else than piety farming though, since as soon as you level up, you need to find a new X+1 enemy.
Anyway, my best strat with the Troll so far allowed me to do this :
Let's see if you can guess how I did
