[Suzerain of Sheol]

Well, Coda, about the same time as your post there he just splattered me with his special attack. I made it all the way to the Unlimited Gaster Works at the end, my heart just happened to be on the wrong side of the box when they started spinning. Definitely getting better, though, on that run I didn't even need to heal until the second part. I think I'll get him soon (and then wonder why I bothered...)