Firefist stacks with monk epic + robe?

[Kiwix]

Does Firefist stack with monk epic (Celestial Tranquility)?

Does Firefist stack with Jonthan's Whistling Warsong?

Thanks in advance.

[Darkatar]

Well, firefist doesn't stack with grim aura, so grab a gobbie earring and test with that.

[Troxx]

Shouldn't stack with epic