The way Legendary Air Strike is worded makes me think it would proc when I wield it in my off-hand while throwing shurikens, but after extensive testing on the ship's magefire cannon I didn't see it proc at all.
I equipped the kama in my main hand and hit the cannon a few times and I saw it proc for 3.1k damage. So it's not completely bugged. But still, it say "attacks and spells" doesn't specify if the attacks need to be from the weapon itself.
Is this WAI?