Who should I use my 4* Signature Abilitiy Awakening Stones on?

BlueRanger2012

None of them are duplicates. I have 40 unopened 4* Signature ability stones unopened. Or should I just wait until I get other champions?

DiablosUltimate

Thats easy, use them all on howard the duck, you won't regret. He's viable in all modes of game, according to empirical data he is among most effective attackers in war, also great for long fights because he stacks fury like crazy - labirynth of legends (they say he has a power of a milion quacks), but also won't fail to not dissapoint in story mode, thanks to his superior regen