This may seem a silly question. Do these 2 talents stack to 100% mana regen? Are they multiplicative, and take me to 75% mana regen? Or will I just get 50% regardless?
hmmm yeah they add up to 100% which is the MAX you can have.
But really why would you want to know this?
Not in any reasonable mage build you have points for both. For fire Mana is no issue anyway, and well for arcane yout dont even have the points for a tier 2 talent in the fire tree.