COILL ABYSS.
I think Don already did a pretty comprehensive thingy on this dungeon, but I have my own tale to weave now.
IT isn't really that horrible, honestly.
It's a challenge, but not unfair. Unless you get Giant Sprites.
Anywho, the first 3 rooms have 3 waves of mobs that attack you.
Lynx/Dingo is probably the easiest one, with Larva being second, and Plants being third.
The hardest two are Ghosts, like, 8 ghosts, "Not Peaca ghosts, though" that insta-aggro with decent range. You really need to abuse the corners for this one* and Giant Sprites, the most BS thing ever according to others. With Play Dead and Snap Int magic, I only had a moderate amount of trouble with the hard waves.
Now, the boss. Giant walking tree, actually really easy if you have any idea what you're doing.
Now, he has ass tons of HP, so you need to be careful, but his attacks are really easy to dodge.
He has 3 basic attacks:
Snare, he raises his arms and slams them into the ground, roots you in place for a few seconds and does 150 damage over a few seconds, then hits you again and pulls you to him. Completely nullified by using defense before he uses it.
Stomp, He does a thing with his arms, jumps into the air, and messes you up bad if you're in the radius, which is random per stomp (Comes in small, medium, and huge sizes)
360 degree fuck you mode claw swipe: Not a horrible attack, but it does a lot of damage, and stuns you for a few seconds. Shortish range.
Now, how to fight him. I did it by kiting him around a tree in the corner, and hitting him with bolt magic. And Spear of God. Spear of God does a couple percents of damage to him.
The tree WILL block his stomp attacks if you can get it between you and him, but it will NOT block the snare, gotta use defense on that.
But yeah, that's it. The dude has 230k health, so be prepared to beat on him for a while, but he's easy to deal with otherwise. Have fun, kiddies.
*Each corner has a tree that blocks line of sight, so use the fuck out of these.