When you cast it, they get the debuff applied. The debuff reduces resolve by X. Doesn't make sense for the ability which applied the debuff to benefit from it, especially considering the wording, ie. you land it, then it reduces. Might be wrong though.
You can apply it in an AoE, but don't have another TC AoE to benefit from it.
There's also the issue of not having any real idea of how Resolve works. How many resists do you get with 300 TC anyway?
Maybe, but do remember that there are different TC spells, even though only one you can use with LoC's AoE. Remember when I mentioned that I had several cases of my LoC's-buffed spell being resisted by an enemy or a couple of it? Mental Subversion might be a kind of a fail-safe for when that happens. Unless Styg or epeli denied it, we can assume Mental Subversion counts no matter if a spell is resisted or not; the point is that you 'land' the spell, that's it. So, for example, we cast an LoC-buffed Enrage to make a group fight with one another. But then, one guy or two resisted Enrage, but since you 'landed' Enrage upon them by way of LoC, and Enrage counts as a powerful ability that caused heavier mental subversion, then the next TC spell you cast upon them, like Fear or Mental Breakdown, will have higher chance of taking effect.
Similarly, even if you don't have another TC AoE to benefit greatly after having an entire group being mentally subverted in a single move, you can still have your next individual spell guaranteed to take effect, like if you cast Mental Breakdown AoE will guarantee that an individual Enrage will work on one specific enemy, instead of casting Enrage AoE that have lower chance to work on said enemy.
This is just all my theory, though, so yeah we really need to know how Resolve truly works. Gotta wait for epeli to give us the numbers.
You could also drop TC completely and take the new one instead? I think TC is the worst one to get "partial use" out of. Super fun though.
I did TC
eta, no psychokinesis, everything was smooth except robots (fuck Arke). Wouldn't recommend.
Oh, I have no intention of using TC 'partially'. It's just that, IMO, Cerebral Trauma is a rather straightforward feat that increase the main TC bread-n'-butter spell, with an additional effect of burning target's psi reserve if they have any. Psi-burn is essential against Lunatics, Psi-Beetles, and Coil Spiders, but they're all enemies that can be burned and/or frozen through Metathermics, hence why Cerebral Trauma is the feat I'm considering dropping because I want to shift my usage of psi spells, on top of to augment my defense with Power Management.
But since you reminded me of Expedition, and how we can still do traditional leveling-up into veteran levels and, thus, take 3 extra feats, I'm considering putting this build on hold and see if I can take ALL of psi feats AND couple of other feats like Doctor/Fast Metabolism, Power Management and Neurology.