The defense one is more useful than I initially thought. Since each turn counts as “one tile” on defense, you can figure out how to optimize mana bonuses. Here’s a depiction of tiles needed to charge your character as turns go by:
Example… It is beneficial to have a 12% mana bonus on an average speed hero because after the third turn, they would be fully charged if 12 tiles hit them (because each defence tile counts as 0.5 tiles towards mana regen):
I can make more turn-based mana sheets if enough people find them useful.
EDIT: Clarification of example