Sorry, but I don't think any of them measured up to the King Ant in Millennium. I killed all of them the first time and I don't think I had to revive anyone at all. I did have to do some healing though. I was playing at a pretty high level though because I wandered a lot looking for hidden locations.
dee0227
Inside every older person is a younger person wondering what the heck happened.
I, too, could beat them all pretty easily because I had leveled up a lot thanks to all my dithering around looking for stuff. However there was one fight that was shockingly hard despite the fact that everyone in my party was level 58 and up, which was the one in the witch path thing where you get the black sword...these freaky two headed rabbit things. I had to try to kill them several times until I figured out a state they were vulnerable to...that to me was the hardest.
The three screaming bunny things in Snake Road on Crescent Island. Sorry I don't know their names because they surprised me and Grom doesn't always do Enemy Information on a Surprised Party. But they almost did me in. I had to use two of those whole party healing/revive things and still only made it out with one person alive at that was at a very high level. On a level with the King Ant.
dee0227
Inside every older person is a younger person wondering what the heck happened.
What about Monstrodon in the witch shack? I was looking for hidden areas and all of a sudden hello Monstrodon wipes my entire party out. Those are the surprises I like to discover. When you least expect something and your guard is down you have Monstrodon.
Thanatos is fast and Deadly, Dodo, once you know his weakness, he is nothing, Bone-Breakder(Indy ) is vunerable to sleep, Nawell that was a hell of a battle for me, and the others, are just others .