Yesterday a new mastery was added. This is the description:

Warmaster:

Has a 60% chance of inflicting bonus damage 

Bonus damage is equal to 10% of target's max HP or 4% of target's max HP for bosses.  Bonus damage can only occur once per skill and does not count as an extra hit.

After doing the math, for clan bosses, this mastery will do more damage for anyone who averages less than 3 hits per attack. (3 hits per attack would make it completely even damage)

This makes this mastery better than Giant Slayer for almost every hero.  With such a profound mastery addition, can we please get free mastery resets for all heroes?

I have a few now that I want to switch over and don't want to have to fork over 150 gems each just because this wasn't an option when I reassigned my masteries.