Abyssal demon

Abyssal demons are located at the top of the Morytania Slayer Tower, in Kuradal's Dungeon, and in the depths of the dark Abyssal Area (which is not the Abyss location used in Runecrafting) accessible through fairy rings with code A-L-R. Only players with level 85 Slayer can fight these demons and obtain their drops. Abyssal demons share similar, although slightly better, drops with black demons.

Abyssal demons are the ultimate goal of many slayers, because of the rare and valuable Abyssal whips they drop. The whip is regarded by many as one of the best weapons in RuneScape, so it is always in demand and sells well on the Grand Exchange. Slaying abyssal demons can therefore be very profitable. They are often slayed rather than Dark beasts because the Dark bow they drop is currently worth much less than the Abyssal whip, and Dark beasts have a higher Slayer level requirement, making it not worth the effort money-wise.

High levelled players may find it easy to stay for long periods of time, using a healing weapon such as a Saradomin Godsword (or Enhanced Excalibur), a healing familiar (e.g. bunyip), or a combination of the two, or Guthans. Prayers such as Soul Split can also be utilized to extend life points. These methods, along with an occasional lobster drop, can sustain most players for hours.

If players bring an Abyssal demon head to the Taxidermist in Canifis, she will remark "It's still glowing" and that the effect is preservable with magic, despite that neither the living nor stuffed versions of the Abyssal demon glow.

Abyssal demons seem to fade and shrink slightly when they are hit.

Abyssal demons and Cave horrors were the only Slayer monsters that did not receive a graphical update on or around the time the Smoking Kills quest was released in 2008.

Strengths and weaknesses
As the Abyssal demon is indeed a demon, it is affected by the powers of Silverlight and Darklight. Abyssal demons' max hit of 81 life points is very low considering their level. This makes them very good targets when using Guthan's or Dharok's sets because of the low risk of dying. However, if using Dharok's set, players should consider activating Protect from Melee.

Abyssal demons have the unusual ability of teleporting around the room while also teleporting the player at the same time. While the player always ends up in one of the eight spaces next to the abyssal demon, it is possible that the ending position will prevent ordinary melee combat. For example, if the demon teleports east of a terrain feature and the player south of it, melee combat is not possible (except if the player has a long weapon like a Halberd). If auto-retaliate is turned off, the player will have to click or right-click to resume attacking. (Shifters, the Chaos Elemental and Imps are the only other monsters that teleport during battle, but only the Chaos Elemental actually teleports the player. Nomad, the boss from Nomad's Requiem, also teleports himself and the player.)

100% drop

 * Ashes

Weapons

 * Abyssal whip (rare)
 * Dragon spear (extremely rare)
 * Rune battleaxe (very rare)
 * Rune 2h sword (very rare)
 * Rune spear (very rare)
 * Black sword (common)
 * Black hatchet (common)
 * Steel battleaxe (common)
 * 150 Steel arrows (very rare)
 * 20 Adamant javelins (very rare)
 * 5 Rune javelins (very rare)
 * 42 Rune arrows (very rare)

* The drop rate of whips is debated very often. However, data collected by three slayers resulted in 83 whips in 38241 demons, or 1 per 461 demons (95% confidence interval of 1/379 to 1/588)

Armour

 * Dragon medium helmet (extremely rare)
 * Rune chainbody (uncommon)
 * Rune medium helmet (uncommon)
 * Rune kiteshield (extremely rare)
 * Rune square shield (very rare)
 * Mithril kiteshield (uncommon)

Runes

 * 50 Air runes (common)
 * 7 Blood runes (common)
 * 10 Chaos runes (common)
 * 67 Nature runes (very rare)
 * 3 or 45 Law runes (3 is uncommon, 45 is very rare)
 * 45 Death runes (very rare)

Other

 * Nothing
 * Coins (30-3000) (common)
 * Lobster (common)
 * 60 noted pure essence (common)
 * Level 3 Clue Scroll (rare)
 * Dragon shield left half (extremely rare)
 * Loop half of a key (uncommon)
 * Cosmic talisman (uncommon)
 * Nature talisman (rare)
 * Chaos talisman (common)
 * Defence potion (3) (uncommon)
 * Uncut Gems (common up to diamond)
 * Cut Dragonstone (extremely rare)
 * Herbs (up to Dwarf weed) (common)
 * 100 noted silver ore (extremely rare)
 * Runite bar (rare)
 * Adamantite bar (uncommon)
 * Abyssal demon head (extremely rare)
 * Tooth half of a key (rare)
 * Ferocious ring (Kuradal's Dungeon) (uncommon)