Medium Elemental, chaotic evil
Armor Class 13
Hit Points 49 (11d8)
Speed fly +40, walk +0, hover true
Challenge 1
Damage Resistances lightning, thunder
Damage Immunities poison
Condition Immunities exhaustion, grappled, paralyzed, petrified, poisoned, prone, restrained, unconscious
Senses darkvision 60 ft., passive Perception 11
Languages Auran
Air Form. The bilwis can enter a hostile creature's space and stop there. It can move through a space as narrow as 1 inch wide without squeezing.
Slam. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) bludgeoning damage.
Whirlwind (Recharge 5-6). Each creature in the bilwis' space and within 5 feet of it must make a DC 12 Strength saving throw. On a failure, a target takes 14 (4d6) bludgeoning damage and is knocked prone. On a success, a target takes half the bludgeoning damage and isn't knocked prone.
Source: Creature Codex · OGL/Open