An idea for a utility tree mastery.

If you have insufficient mana to cast a non-ultimate ability, you may still cast that ability, expending all your current Mana. This effect cannot be used more than once every X seconds.

Dunno what an appropriate value for X would be. Probably somewhere around 60-90 or something.

Ideally, it would be somewhat deeper into the tree so it can't be taken as a 9th point. Mostly something fun for supports, so they aren't QUITE sitting on their hands when low on mana. Never know what sort of plays a support might be able to pull with one extra ability cast.

I just feel like we could do with some more "interactive" masteries. We only have a few right now, like Expose Weakness and the two Weavings.