GMS Evan release confirmed! March 2010!

Sixth mastery: (this one is quite strange, as it has many diferent ways to build it)
First build:
Max magic booster
Max critical magic (ooh yes!)
Max dragon thrust
You should care that much for slow

Second build:
Critical magic to 10
Booster to 10
Max dragon thrust
Max critical magic
Max booster
Leave slow at anything you want

(choose whatever you want, you can mix the builds too)

Maybe it's just my AM preference kicking in, but I prefer to have maxed Slow and leave Thrust at 15 (a loss of 15% won't kill you).