This is a Pathfinder adaptation of the “Mourning Haunt” creature in the “Mark of Prophecy” adventure from the Eberron Campaign Guide (4E). (Note that this is a CR 5 version, because I was running this adventure at 3rd level. For a CR 3 version, reduce it to 2 HD and lower its natural armor to +6, which will give it AC 16, hp 27, change its to-hit to +4, and change its Haunting Fog ability to DC 12, 1d4 damage.)
A Mourning Haunt resembles a white-furred demonic ape, and is about 7′ tall. Tendrils of dead-gray mist unwind from its fur, concealing it in a cloud of fog. Its eyes are blank white orbs, and its mouth is full of long, sharp teeth. Four curling horns jut from its skull.
CR 5/XP 1600
CE Medium Humanoid (demon)
Init +0; Senses blindsight, darkvision 60 ft.; Perception +4
Aura mourning aura (constant)
AC 18, touch 10, flat-footed 18 (+8 natural)
hp 57 (6d8+21)
Fort +4, Ref +5, Will +4
Defensive Abilities displacing hit (at will); Immune electricity, poison; Resist acid 10, cold 10, fire 10
Speed 30 ft.
Melee Bite +7 (1d6+2/x2) and Claw x2 +7 x2 (1d4+2/x2)
Spell-Like Abilities Haunting Fog (2/combat) (DC 14)
Abilities Str 14, Dex 10, Con 14, Int 9, Wis 10, Cha 12
Base Atk +5; CMB +7; CMD 17
Feats Iron Will, Multiattack, Skill Focus (Acrobatics), Toughness +7
Skills Acrobatics +5, Climb +6, Perception +4
Displacing Hit (Reaction) (Su) When hit by a melee attack, the mourning haunt instantly teleports to a safe space of its choice up to 60′ in any direction. It does not require line of sight, but cannot teleport through force effects. The creature must use this ability when hit by a melee attack, but may choose to teleport as little as 5′ away. This is an instant reaction and does not provoke attacks of opportunity.
Haunting Fog (2/combat) (DC 14) (Sp) A 10′ square area is filled with swirling gray mist that burns all within and may immobilize them. Anyone who enters the fog or is in the fog at the beginning of their turn take (1/2 hd)d4 fire damage (3d4) and must make a Ref save or be immobilized. Once placed, the fog remains until the haunt dispels it or is slain. Mourning haunts are immune to this effect.
Mourning Aura (Constant) (Su) The mourning haunt is surrounded by a 10′ radius aura of swirling gray mists. It has full concealment against creatures outside of the aura, and regular concealment to creatures within it. It takes no penalties from the concealment itself and its darkvision can see perfectly through the mist.
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Pathfinder® and associated marks and logos are trademarks of Paizo Publishing, LLC®, and are used under license. “Mourning Haunt” and its lore ©2009 Wizards of the Coast, from material written by James Wyatt, Keith Baker, Ari Marmell, and Robert J. Schwalb. This conversion is fan material only, no assertion of ownership is intended or should be inferred.