This creature appears as a semi-solid cloud of vapor and mist.
Mihstu CR 6
AC 23, touch 17, flat-footed 16 (+6 Dex, +1 dodge, +6 natural)
hp 60 (8d10+16)
Fort +8, Ref +12, Will +4
Defensive Abilities resistance to missile attacks; DR 10/ magic; Immune electricity, elemental traits; SR 13
Weaknesses susceptible to cold
Speed 20 ft., fly 20 ft. (good)
Melee 4 tentacles +14(1d6+1)
Special Attacks constitution damage, engulf
Str 12, Dex 22, Con 14, Int 14, Wis 14, Cha 13
Base Atk +8; CMB +9; CMD 26
Feats Dodge, Improved Initiative, Mobility, Weapon Finesse
Skills Acrobatics +14, Escape Artist +14, Fly +21, Knowledge (the planes) +13, Perception +13, Sense Motive +13, Stealth +17, Survival +10
A mihstu deals 1d2 points of Constitution damage to an engulfed opponent each round the hold is maintained.
A mihstu can try to wrap a Medium or smaller creature in its body as a standard action. The mihstu attempts a grapple that does not provoke an attack of opportunity. If it wins the grapple check, it establishes a hold and can slash (with a tentacle) the engulfed victim with a +4 bonus on its attack roll. It can still use its tentacles to strike at other targets.
Attacks that hit an engulfing mihstu deal half their damage to the monster and half to the trapped victim.
Ranged attacks (including magic missile) used against a mihstu have a 50% miss chance.
Cold-based attacks and effects deal no damage to a mihstu, but stun it. If the cold-based effect allows a saving throw and the mihstu succeeds on its save, it ignores the stun effect. If it fails its save, or if the effect doesn’t allow a save, the mihstu is stunned for 1d4+2 rounds.
Environment Plane of Air
Mihstus are semi-solid creatures from the Plane of Air. They are found in cool, damp, dark areas such as ruins, dungeons, and underground caves and caverns. The mihstu can shape its body at will and almost always appears on the Material Plane as a cloud of swirling vapor. It can seep through small cracks and openings.
When threatened, a mihstu forms four tentacles from its body. Each tentacle ends in a razor-sharp, barb-like talon. It slashes at its opponents using these tentacles. The mihstu can also engulf an opponent in its misty form. A mihstu’s natural weapons are treated as magic weapons for the purpose of overcoming damage reduction.
Mihstu from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene, based on original material by Gary Gygax.