sans but he makes a somewhat good clone of himself and any failed clones he would kill due to it giving no LV but did make his eye glitch making his magic stronger but at the cost of damaging his skull a bit the clone mostly surpassing sans in hp but does still maintain a similar personality to sans just creepier and quieter there's 2 phases Phase 1: the sans and his clone block your path at the core before the NEO fight so your LV is 15 and the clones attacks are gray while sans's is white with a hint of glitch which does make it change the way it moves Phase 2: the clone takes a hit for sans and the clone tells sans to run and so he does the clone now puts up his final stand pulling out that phase 2 logic and at the final attack he does the unthinkable knocks you and himself into the core erasing the both of you which did give flowey control of the timeline once more (lame idea i know) and mettaton saw the whole thing but he just recorded it cuz why not
