ToME: the Tales of Maj'Eyal

I was in the godfeaster and in a tentacle tree on a solipsist earlier, and my mental sustains were getting knocked off left and right without my psi bar being anywhere near being empty
it seems that Corrupted Negation removes mental sustains, when, according to their ability descriptions, they aren't supposed to
and I'm not sure whether or not Acidfire is also a culprit, but I know for sure that I lost mental sustains on the same turn during which I saw the corrupted negation graphic right over my character

I am very sure that it was not caused by the ability of some rare/unique/randboss; regular NPCs were doing this

Corrupted Negation removes mental sustains even in vanilla, for the record. According to the source code, it doesn't have any code at all to differentiate between the different types of sustains. I suspect this is more a matter of the description being inaccurate then the talent itself being bugged. The talent description doesn't even mention sustains at all. Of course, neither does Disperse Magic...

Yes corrupted negation is one of the most untrue tooltip. It can remove all types of effect and sustains which is NOT what it says it does

It can still only remove magical/physical temporary effects, even if it can remove all types of sustains.

Ah damn should have read Stof's explanations better