Deathless Nature. The erraised doesn't need to eat, drink, breathe or sleep, and magic can't put the erraised to sleep. However, the erraised may continue to mimic these behaviours out of the belief that they are necessary.   Illusory Appearance. The erraised is permanently under the effect of the seeming spell, which hides the visible aspects of undeath.   Undead Fortitude. If damage reduces the erraised to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the erraised drops to 1 hit point instead.