Gotcha. I had 80 Awareness here, so I assume that even more Evade probably would have helped. More HP might have too.
But also, more luck probably would have helped. It looks like I took 12d20, but one of the 4d20 hits was a critical hit, and basically every attack must have rolled high to do that much damage. I'll be cautious around them, but it seems like a tall ask to assume they'll roll like this every time they get a turn.