Class looks good, but remember there are only 6 tiers. 

Loki, for the tiers I would just put something very simple. Say, Tier 2- class x gets more y
Tier 3, specializations
Tier 4. some abilities unlock
Tier 5, stat boost, some abilities
Tier 6, get some cool upgrade or move, I chose to do a great special for the Spellblade class. Speaking of which, I have to do more work on the Spellblade class.