Is arcane cloak affected by global increases to mana cost such as indigon?
Does spending that mana count towards mana spent for indigon?
Is arcane cloak affected by global increases to mana cost such as indigon?
Technically yes in that it's possible to raise it's mana cost above zero and then modify that with % modifiers. That won't have any effect on what the skill does though. The spending the skill inherently does is not a cost, and it's other effects only care about the amount of mana spent on that, not on costs.
Does spending that mana count towards mana spent for indigon?
It is spending, so yes.