On expert 😜 to get the void kills. So... a tip. Lol, also... the final boss breaks are puzzles. Didn't realize it till now. You draw a pentagram. I've just been waiting previously through phase 1 killing adds, never noticed it 😁. It took 1.5 runs... to get the Void kills. Also, they changed the Ultimate scoring so getting the triumph can be done in matchmade. Edit: I assumed since it was a FotL challenge, that the void kills needed to come from Haunted Altars or Red Rum. That is incorrect. You can get the void kills anywhere. Credit to both @Guardian,Archon Of Light & @Awtiii for the clarification and correction, thnks.