Any innate kuva element, I guess? The idea is that you're using something like Rest & [Rage], Lull or Sleep Arrows to get stealth finishers which converts all damage to "True" damage so, honestly, element doesn't matter. Was thinking innate elec with the planning though. You know... corrosive v. ferrite armor grineer things and viral/elec CO build possibilities. Also, berserker doesn't affect finisher animation speeds for some reason so use (Primed) Fury/[Gladiator Vice] instead.