Just beat the Tonberry King, and from what I can tell the first phase is add pops > Rancor > Everybody's Rancor, while the second phase is just a race to get his HP down before everyone gets owned.
Has anyone tried doing the first phase sleeping/kiting the Tonberry adds, but keeping them alive so the king can't stack rancor? Towards the end of my fight he used his move without any rancor and it didn't do much (Other times I had buffs coming out of my wazoo and he still lowered me to a couple hundred HP). Just a theory, let me know if you have any other ideas!
Also does anyone know if the flan boss has a strategy? it just seemed like an aoe'n'kite fight as soon as the adds popped, we beat it on the third try but it just felt like luck.
ALSO! Both are really challenging and fun fights, good work SE!