Alazai 2014
CR 10 elemental
Large elemental, chaotic neutral
Is invisible in most situations. The following situations reveal its location and enough of its form that attacks vs. it don’t have disadvantage while the situation lasts:In temperatures lower than 50 degrees Fahrenheit or for 1 round after it takes cold: its natural heat outlines it in steam.Darkness: its burning eyes shine visibly marking its location.
Doesn’t require air food drink or sleep.
Can move through a space as narrow as 1 inch wide with o squeezing. A creature that touches it or hits it with melee attack while within 5 ft. of it takes 4 (1d8) fire.
Struck by a cold iron weapon becomes visible and can’t use Hurl Flame or Scorching Aura until start of its next turn.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details