Would love some unique talents or even twists to existing or well known "perks" Like if my mage has telekinesis combined with a high perception and a point in a perception talent, that would unlock an "illusion" talent that would make enemies have a chance to start attacking things art are not really there or when used on NPC's cause them to hallucinate and wander off. (great for pesky guards that just won't budge)
Never been a fan of abilities with curses myself and those are the ones I never get. If you went with a talent that bumped up a stat by say 25% but decreased another by same amount, it's not much of an improvement and most certainly a downgrade to your chars abilities.
Say you put a point in +25% fire -25% ice talent for half your party (or worst case even all party members) in order to get past a tough fight or environment with lots of fire effects, you then either HAVE to put next talent point in +25% ice -25% fire talent just to get back to where you were originally in resistance or potentially have your party members be almost useless in frozen combat.