It will Display a numeric killorder above the Nameplates.
Standard Killorder is Summoner > Souljudge > Goliath.
Under Custom Options you can activate an automark option which marks the highest priority target with a skull raidmarker.
Base Weakaura "Totem Killorder (King's Rest)" by Causese
Glow-logic from "Sun King's Salvation Kill Priority" by Jilong