Whelp, now I know why they say Sans is called the hardest boss. And I thought Undyne the Undying was hard. HA! Seriously I died like 50 times to her. But Sans? GOD HE'S POWERFUL. and you never get invincibility frames, so it's even harder. I've been battling him with friends, and we've died 38 times to him so far. And the furthest we've gotten is to two turns after he spares you. Strangely enough thou, I'm less frustrated in this battle than the battle with Undyne. Either way, it's gonna be a long time till I get to the end, that's for sure.