Some great tips, some ones that need to be revised.

Quote Originally Posted by Lyrinn View Post
Stop spamming Medica II.
Medica 2 spam is great in crystal tower. It has 5 yalms more radius (10 yards total more reach) than medica. If you're not running out of MP or pulling, you should probably be using Medica 2 in crystal tower because the battle fields are so large.

Quote Originally Posted by Lyrinn View Post
Acheron always uses Quake after Megiddo Flame and Quake III after Moonfall Slash.
Pre-cast your Medica/Medica II/Succors please. People shouldn't be dying to the hands because they got grabbed at 500 hp because you took 5 seconds to react.
Succor won't absorb any of Acheron's AoEs. Neither will Stoneskin. Not sure if it's a bug or intended.

My personal tip:

If you're an Scholar -- keep shadowflare down on behemoth 100% of the time. There probably isn't a summoner doing it and he's one of the few bosses in the games that can be affected by slow (there are other crystal tower bosses too, but behemoth is the most important one for this as tanks really don't die on other fights.)