Demon

Demons are a class of creature; many are characterized by a mix of human- and beast-like features, often in hellish black or red colours. (Abyssal demons, however, look quite different.)

Demons usually come from other realms, and most if not all are servants of Zamorak. They are generally considered to be fairly strong, except for imps, and have low defence strengths. The ability to slay stronger and stronger demons is often a personal landmark for many players. Demons are especially weak towards magic but not so weak towards melee attacks. The magical swords Silverlight and Darklight are enchanted to be especially effective against demons.

The following monsters are demons. There are also several demonic monsters in quests:
 * Impling
 * Impling defender
 * Imp
 * Lesser demon
 * Greater demon
 * Black demon
 * Abyssal demon
 * Nechryael
 * Death spawn
 * Imp Champion
 * Lesser Demon Champion
 * K'ril Tsutsaroth
 * Balfrug Kreeyath
 * Zak'ln Gritch
 * Tstanon Karlak
 * Revenant Demon
 * hellhound (half and half)
 * Delrith
 * Nezikchened
 * Jungle Demon
 * Chronozon
 * Agrith-Naar
 * Othanian
 * Holthion
 * Doomion

Demons in Construction
There is a demon butler named Alathazdrar, who can be hired as a servant for a player-owned house at level 50 Construction for 10,000 coins. Players with level 75 Construction may purchase a level 82 greater demon to guard the Treasure Room of a Player-owned house.

Demons cannot be attacked:
The legendary but deceased Thammaron was an Elder-Demon.
 * Implings and Impling defenders in the Impetuous Impulses Minigame
 * Mazchna, a demonic Slayer master
 * Sergeant Damien, demonic trainer in the Drill Demon Random event.

Miscellaneous

 * Kennith from Kennith's Concerns quest is a 6 year old half-human, half demon hybrid with magical powers who controls the town of Witchaven.
 * Slayer Masters sometimes mention a Bloodveld as a "strange, demonic creature" or a "half-ton demon". However, bloodvelds drop bones when killed, whereas all or almost all other demons drop ashes. This calls into question whether bloodvelds are truly demonic. It is unconfirmed whether magical swords Silverlight and Darklight have their special effects when fighting bloodvelds.
 * According to Evil Dave, Hellrats are demons and are the lowest form of demon, weaker even than imps. Players cannot kill hellrats, but pet cats can.