Because they generally do not appear as passive skills, but rather as active skills or inherent abilities.
The closest example around him would be Fufu's [Smooth Dark Mirror] and Ugly Little Wolf's [Cloud Body].
The main advantage of passive skills is that they can be used together, which is the most valuable aspect.
However, judging by the name of the skill, Li Pu knows that he cannot treat it like the related matter as before, which means completely ignoring the acquisition conditions.
It's clear that to utilize the skill's effect, the summoned beast needs to have a skeleton.
As a result, upon thinking this way, Li Pu realized that among his summoned beasts, those without skeletons make up the majority.
The Scarecrow, Ugly Little Wolf, and Number 2 all have no bones.
Only Bubu and Fufu are normal (?) flesh-and-blood creatures.
So the answer immediately became apparent.
Bubu doesn't need impact resistance; Fufu, who engages in close combat, does.
