Thanks for the heads up Maotd, that's a lot rougher than I was expecting after reading a few of the event threads.
Might sit this one out and use those 80 Stamina on a SG now that I've been warned.

Do those bosses happen to be weak to the Slice affinity? I have a 4 gear slot Alpinia that just got evolved and is back down to her 20s, but she could solo the 12-5 bosses with some event gear I had thanks to the Wasp's slice weakness and the bonus health she'd leech. If these bosses are both weak to Slice I might take a crack at it on the last day after some farming.