What Mastery to go for after getting the essentials?

FreeToPlay_21

I've got the essential masteries (3/3 in Parry, 1/3 in Dexterity, 5/5 in Precision and 5/5 in Cruelty). I'm a F2P player so please keep that in mind while suggesting. Also, I can't care less about AW Defense.

Fingfangfoomfanes

Glass canon, if you have grinded for units to get those cores.