Entity: Compact Skeleton

Source Book of the Dead pg. 55

For tasks that require a lighter touch, gnome, goblin, and halfling remains are more suitable than a larger creature's. These smaller, nimbler skeletons fit well in a traveling chest, can be forced through tight spaces, and more easily avoid detection. Your size is Small instead of Medium. You gain the Quick Squeeze feat, even if you aren't trained in Acrobatics. Tight spaces not tight enough to require the Squeeze activity aren't difficult terrain for you.