Undead are fearsome

Here's the draft for Undeath Aura, shared by all undead.

Undeath Aura (100 ft): Affects living creatures. At the start of your turn, or as soon as you perceive the undead creature, make a Will Save against the listed DC. Intelligent undead may suppress this aura, but the unnaturalness of the living dead is so strong this is a Sustain action each round, unless the individual monster entry says otherwise. Critical Success: No effect. You become immune to Undeath Auras of the same or lower level for one day. Success: No effect. You become immune to Undeath Auras of the same or lower level for one minute. Failure: You dare not approach or target the source of your fear during your turn. You get a new save at the start of your next turn. Critical Failure: As Failure plus you become frightened 3 and must choose to either flee the area or cower in place. If you are caught out in the open the GM may deny you the choice to cower. In that case you must choose to flee the area. If you choose to flee the area you become fleeing for as long as you are frightened. If you choose to cower in place you become prone for as long as you are frightened.