I would guess a Gashadokuro.. meaning spiderdad is quite literally screwed because there's no way he can fight and kill an invincible skeleton that's literally fueled by rage.
https://yokai.com/gashadokuro/
Not sure if anyone's mentioned this yet but the Light novel's just got an official English release early in February. Here's the amazon link if anyone's interested https://www.amazon.com/dp/B08PKPCMG2?tag=jnovelclub0b-20