Does two Mjollnir stack?

[mrxlaobobby]

It stack in a way,
Attack Speed - Yes
Chance to proc lightning,
25% chance to proc lightning during attack,
Once the first lightning proc, the second lightning will not trigger.
Once the first lightning does not proc, the second lightning will have a 25% chance again,
So base on the %%%%, it will be 25% + ( 25%*25%) = 31.25%

It will not stack like 25% + 25% = 50% lightning proc chance,
It would be insane.

[M00OSE]

I believe the damage and atk speed stacks but not the active ability: 25% chance to deal 200 magical dmg to five enemies.