Quote Originally Posted by Rbstr View Post
Mana cost on TIII doesn't even matter if you're putting it after BIII in your mana phase. It'll all regen by the time you get your next FIII off.
Has nothing to do with the mana cost, it has everything to do with the time you spend casting Thunder III and how many Fire cast it cost you in a boss fight. Thunder I > II and III. Period. Thunder III at the start as the tank is pulling, and during TStorm, that's it.