Thunderbird boss with party of 4. Worst possible match up for the players. But as game designer, I'm happy we still have a threatening boss. Still a pushover with less people.
The vines is also a joke if you have aoe that kill the allies. The boss cannot do anything after that. I think with enough mana item, you can solo that boss. He doesn't do so much damage with this setup. Thunderbird is still threating when it doesn't get initiative as long it survive which also a reason why I want an hp buff. My personal score for the boss are Thunderbird 8/10, Vine 5/10 and Boar 1/10
The vine boss has an annoying problem of having 20 WIS + the mobs tend to get 15+9 WIS. On top of that that WiS tends to get them first attack which can be deadly for low AGI players. Aka it is the worst possible matchup for me. That being said it is free for physical players.