[Soapy]

tl;dr Stun is a bullshit status effect to get hit by, and Skullcaver is by far the worst instance of it since the only requirement is RNG.

I propose changing Skullcaver's effect to:

On Hit: Inflicts Flatfoot LV(UL/2).
On Critical: If target is flatfoot, inflict Knockdown.

This would keep the whole 'knocked silly' theme without it being too strong (or random).

(Knockdown on crit isn't as crazy as it sounds, Hands of the Giant/Cutthroat/Haunted Soul Deadly Smile all do the same thing.)