I was playing cursed with all 3 grim relics activated and this mimic with red glow started spawning on round 54 every round except ravager rounds. It was shooting purple orbs. I had ray gun mk2 and necrofluid gauntlet. What i did the last few rounds before this was buying the gun inside the house at the lake and try to shoot the wine bottles that were bugged ( i recorded the order on video and it wasnt working ) and picking up my ray gun mk2 off the floor from time to time to prevent it from despawning. 54 was the first time he spawned , 55 was ravagers , 56 he respawned at begining of the round and i died on that round. 1st sinister relic is a jump pad doppelghast kill and 3rd one is a melee bear kill , so it would make sense if a mimic is involved for the 2nd one i think. Also the missing relic is the weapon swap one and thats what i was doing in round 53 with the wall buy and ray gun mk2 . Just couldnt figure out what to do with the mimic itself. I was thinking maybe a dg2 kill but i didnt do the keys in that game. Maybe a zap from the car kill ? Who knows 🤷♂️