Undead Empathy Feat 1
Source Pathfinder Book of the Dead
Your relationship with undeath gives you a stronger bond with other undead. You can use Diplomacy to Make an Impression on mindless undead or make simple requests of them. As long as there aren't living creatures nearby, they usually let you speak. If the undead creature currently is in the thrall of a creature whose level is higher than yours, you typically need a critical success on your Diplomacy skill check.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
SkeletonThis undead is made by animating a dead creature's skeleton with negative energy. An ability with this trait can be used or selected only by skeletons.