Achaierai (CR 5)

Large Outsider (Evil, Extraplanar, and Lawful)
Alignment: Always lawful evil
Initiative: +1 (Dex); Senses: darkvision 60 ft., Listen +11, and Spot +11


AC: 20 (-1 size, +1 Dex, +10 natural), touch 10, flat-footed 19
Hit Dice: 6d8+12 (39 hp)
Fort +7, Ref +6, Will +7
Speed: 50 ft.
Space: 10 ft./10 ft.
Base Attack +6; Grapple +14
Attack: claw +9 melee
Full Attack: 2 claws and bite +4 melee
Damage: Claw 2d6+4, bite 4d6+2
Special Attacks/Actions: Black cloud
Abilities: Str 19, Dex 13, Con 14, Int 11, Wis 14, Cha 16
Special Qualities: SR 19
Feats: Dodge; Mobility; Spring Attack
Skills: Climb +13, Diplomacy +5, Hide +6, Jump +21, Listen +11, Move Silently +10, Sense Motive +11, and Spot +11
Advancement: 7-12HD (Large); 13-18 HD (Huge)
Climate/Terrain: Infernal Battlefiend of Acheron
Organization: Solitary or flock (5-8)
Treasure: Double standard

Source: Monster Manual

Black Cloud (Ex): Up to three times pet day an achaierai can release a choking, toxic black cloud. Those other than achaierai within 10 feet instantly take 2d6 points of damage. They must also succeed at a Fortitude save (DC 15) or be affected for 3 hours as though by an insanity spell cast by a 16th-level sorcerer.

Evil Subtype

A subtype usually applied only to outsiders native to the evil-aligned Outer Planes. Evil outsiders are also called fiends. Most creatures that have this subtype also have evil alignments; however, if their alignments change, they still retain the subtype. Any effect that depends on alignment affects a creature with this subtype as if the creature has an evil alignment, no matter what its alignment actually is. The creature also suffers effects according to its actual alignment. A creature with the evil subtype overcomes damage reduction as if its natural weapons and any weapons it wields were evil-aligned (see Damage Reduction).

Extraplanar Subtype

A subtype applied to any creature when it is on a plane other than its native plane. A creature that travels the planes can gain or lose this subtype as it goes from plane to plane. This book assumes that encounters with creatures take place on the Material Plane, and every creature whose native plane is not the Material Plane has the extraplanar subtype (but would not have when on its home plane). An extraplanar creatures usually has a home plane mentioned in its description. These home planes are taken from the Great Wheel cosmology of the D&D game (see Chapter 5 of the Dungeon Master's Guide). If your campaign uses a different cosmology, you will need to assign different home planes to extraplanar creatures.

Creatures not labeled as extraplanar are natives of the Material Plane, and they gain the extraplanar subtype if they leave the Material Plane. No creature has the extraplanar subtype when it is on a transitive plane; the transitive planes in the D&D cosmology are the Astral Plane, the Ethereal Plane, and the Plane of Shadow.

Lawful Subtype

A subtype usually applied only to outsiders native to the lawful-aligned Outer Planes. Most creatures that have this subtype also have lawful alignments; however, if their alignments change, they still retain the subtype. Any effect that depends on alignment affects a creature with this subtype as if the creature has a lawful alignment, no matter what its alignment actually is. The creature also suffers effects according to its actual alignment. A creature with the lawful subtype overcomes damage reduction as if its natural weapons and any weapons it wields were lawful-aligned (see Damage Reduction).