I’ve added Stonecleave’s Dire Ghost form buff in the Status Effects list:
Just like Ameonna, he’s immune to all status effects and skill effects.
Unlike Ameonna, he can get hit by Holy enemies. Note that their skill effects still don’t work on him – e.g. you can hit him with Hu Tao while in Dire Ghost form, but Stonecleave can’t be blinded.