If Cthulhu is killed, his body immediately fades away into a noxious cloud of otherworldly vapor that fills an area out to his reach. This cloud blocks vision as obscuring mist, but can't be dispersed by any amount of wind. Any creature in this area must succeed at a DC 45 Fortitude save or be nauseated for as long as it remains in the cloud and for an additional 1d10 rounds after it leaves the area. Cthulhu returns to life after 2d6 rounds, manifesting from the cloud and restored to life via true resurrection, but is staggered for 2d6 rounds (nothing can remove this staggered effect). If slain again while he is staggered from this effect, Cthulhu reverts to vapor form again and his essence fades away after 2d6 rounds, returning to his tomb in R'lyeh until he is released again. The save DC is Constitution-based.