Recluse at the end of the STF is still pretty qualifying, I think. You need a burst healer and a powerful tank just to hold him long enough for your buddies to take out a tower, and if they screw up the order or aren't fast enough, he can snowball quick, even with Incarnate buffs.
Beyond him, Battle Maiden is still pretty rough, though more due to the wonky way that her fire patches interact with height (since they can target a flier and set the area "under" themselves to turn into a burn column that's invisible at ground level). It's more a limitation of the game engine's age than anything.
The Jade Spider is also pretty brutal for wide ranging Psi attacks and also being the size of a building, making attacking the hitbox difficult for melee types without jetpacks. I remember having to spam a lot of purples to just dodge the outgoing damage
Beyond him, Battle Maiden is still pretty rough, though more due to the wonky way that her fire patches interact with height (since they can target a flier and set the area "under" themselves to turn into a burn column that's invisible at ground level). It's more a limitation of the game engine's age than anything.
The Jade Spider is also pretty brutal for wide ranging Psi attacks and also being the size of a building, making attacking the hitbox difficult for melee types without jetpacks. I remember having to spam a lot of purples to just dodge the outgoing damage