Chasme

A chasme was a type of tanar'ri demon found in the Abyss. Chasmes were horrid and disgusting hybrids of human and fly who sucked blood and enjoyed tormenting and torturing their victims. The droning of their wings could lull an unwary being to sleep, who might awake to find themselves being fed upon and tortured. Chasmes often served greater demons as interrogators, taskmasters, or torturers, or in capturing runaways and deserters of the Blood War.

Description
Frightful, wretched, and disgusting in appearance, a chasme resembled a terrible demonic cross between human and fly. With the body of a giant fly, it bore large, buzzing wings and carried six limbs, the two forelimbs resembling long, slender human arms with long-fingered hands. It had a head vaguely like that of a human, but ugly and exaggerated, with tiny mouths and a large horn-like nose. This nose was hard, sharp, hooked, and could bite and suck blood. Tufts of wiry hair sprouted from between the black plates that covered its thick, insectoid body. The chasme could walk upright or crawl upon walls and ceilings as they willed, and of course fly with excellent maneuverability.

A chasme could grow to between 7 feet (2.1 meters) and 9 feet (2.7 meters) in length. However, as suited a flying creature, they were very light, weighing a mere 150 pounds (6 kilograms).

When speaking, chasme had a rasping, buzzing voice, but typically preferred to communicate via telepathy.

Personality
Chasmes loved to fight but immensely enjoyed torturing and punishing others. They possessed average to keen intelligence.

Abilities
A chasme could beat its wings to make a droning buzzing sound that would lull unwary listeners to sleep. Those in close earshot had to its resist its drowsy effects, lest they fall into a deep sleep from which only vigorous shaking or being splashed with water could rouse them. Though once this lasted a number of hours, later chasmes could only make a victim sleep for up to two minutes. Otherwise, victims would awake to find a chasme sucking their blood. Similar to a sleep spell, this droning could affect any creature apart from fellow demons and those immune to sleep magic, such as elves.

Even viewing the hideous chasme was a disturbing, terrifying experience. Formerly, anyone even catching sight of a chasme had to remain firm or else flee in horror for a few hours. Later, a chasme had to generate an aura of fear that affected those in the immediate vicinity, like a fear spell, causing them to flee for only a minute if they could not resist.

A chasme's claws and other natural weapons dealt savage wounds that bled profusely and cumulatively with their number. The bleeding continued until the wounds were treated by a skilled healer or closed through some form of magical healing. Without such treatment, a victim would eventually die of blood loss.

A chasme wielded an arsenal of innate magical powers. At will, they could cast detect good (always active), detect invisibility or see invisibility (always active), insect plague, ray of enfeeblement, and telekinesis, in addition to the spells common to all tanar'ri demons: darkness, infravision (before darkvision became inherent), and teleport without error or greater teleport (itself and possessions only). Later chasmes added contagion, desecrate, dispel magic, fly, protection from good, and wave of grief, at will. Once a day, such later chasmes could also cast unholy aura and even circle of nausea. Some of them could even learn to throw their ray of enfeeblement with great swiftness, thrice a day. They could also use telepathy to communicate with creatures up to 100 feet (30 meters) away.

A chasme that had the need could attempt to summon a number of other demons to its side, with a 40% success rate. Formerly, a chasme could, thrice a day, gate in one fellow chasme, up to twenty manes, or up to five cambions. Later chasme did not have so much back-up, only able to summon one other chasme or up to four rutterkins.

Chasmes were strongly resistant to magic  and like other tanar'ri they were resistant to acid, cold, and flame, and immune to electricity and poison. They could shrug off blows from weapons not infused with goodness and purity or fashioned from cold iron.

Chasmes were expert in the techniques of punishment and torture, but also had a knack for deception and determining one's real motives. They practiced further in these areas, also becoming skilled at intimidation, gathering information, and even a little diplomacy. They could also be quite stealthy and good at noticing things and finding that which was hidden. They were also quite agile and good climbers.

Combat
Enjoying a fight, a chasme was armed with two claws, a bite, and its nose-horn, with which it could gore a target, and all could cause bleeding wounds. It could use all these equally well. It could attack on the wing, diving upon foes, striking, and flying off again.

They preferred to harass and torment their victims before finally killing them. Thus, chasmes used their speed and aerial maneuverability to maintain an advantage at range while assaulting their foes with their spells, typically favoring contagion, insect plague, ray of enfeeblement, telekinesis, and wave of grief. They saved ray of enfeeblement for foes in heavy armor or carrying a heavy load, so they might be overburdened if the spell sapped their strength. Against foes in light or little armor, they attacked with power. They kept their droning ability in reserve in case they were cornered or overwhelmed and had to flee, as they could do little else while they beat their wings in this manner.

Ecology
An adult chasme could spawn up to ten young each year, via pre-fertilized eggs that it laid in the rotting corpses of enormous demons or other creatures. These eggs hatched after three months, and hatchlings grew to adulthood in seven years, though they could lay their own eggs after two.

Chasmes were carnivorous, preferring to drain a sleeping victim's blood via their horn-like proboscises.

Although they could operate over any kind of land or underground, chasmes favored lairs against vertical surfaces with many ledges to roost upon. These included cliff-face rookeries, vast caverns, and treetops. They were common in the Abyss, and especially prevalent on the layers of the Crushing Plain and Torremor, once home of Pazuzu, the demon lord of all evil things that flew.

Preferring the company of their own kind to other demons, chasmes often gathered into gangs of around three to ten members.

Activities
Left to their own devices, gangs of chasmes flew over the layers of Abyss, endlessly hunting for things to torture and torment, hopefully things weaker than themselves.

They would set aside their hatred of other demons for the chance to serve greater demons, even demon lords, as interrogators, taskmasters, or torturers. In this role, they kept slaves and lesser demons repressed and obedient through the application of punishment and intimidation, which they greatly enjoyed. Thus, chasmes sometimes acquired positions of influence and power in the Abyss.

Chasmes had a particular knack for spotting demons that had fled their masters or deserted the Blood War. It was unknown exactly how they did this; some speculated they had a psychic ability to sense the thoughts and emotions of tanar'ri, perhaps even other, non-tanar'ri. Chasmes went to great lengths to recapture runaway demons and bring them back to their masters, so that they might receive a reward and the opportunity to further torture the wretch. They also roamed the layers of the Abyss, hunting for Blood War deserters, and punishing them with a slow and agonizing demise. For this service, they avoided front-line duties in combat formations, and their places were filled by other tanar'ri, which earned no love for the chasmes.

In a few cases, chasmes claimed some small pocket of land on the Abyss or another plane and set themselves up as petty demon princes in miniature. These princelings ruled over minor demons like dretches and rutterkins.

Relations
Chasmes bitterly hated most other demons. They did not like vrocks, viewing them as rivals. They nursed a traditional hatred of succubi, and would kill them given the chance. More powerful demons, like glabrezu and hezrous, they feared and obeyed. Lesser demons, like dretches and rutterkins, they ruled over if they had the opportunity.

Chasmes were in turn utterly detested by other tanar'ri, thanks to their role in recruiting for the Blood War while avoiding it themselves. As a result, tanar'ri often attacked chasmes on sight, with only the chasmes own strength and the support of the demons they served protecting them.

Possessions
Although they carried no treasure, and bore no weapons or armor, chasme occasionally made use of magical items that they came across. They also enjoyed delicate artworks studded with gemstones.

Uses
The wings of chasme were sometimes harvested for use in potions of flying.