In the Dungeons & Dragons fantasy role-playing game, an outsider is a type of creature, or "creature type". Outsiders are at least partially composed of the essence (if not the material) of a plane other than the Prime Material Plane.
All outsiders have darkvision out to 60 feet. As a group, they have no other special abilities or immunities.
Most outsiders have the extraplanar subtype, but those that don't always have the native subtype and live on the Material Plane. Most extraplanar outsiders are from the Outer Planes, but some come from the Inner Planes.
The larva is one of the most selfishly evil of all souls who sink to lower planes after death, and dwell in the gloom of Hades.
The larva first appeared in the original first edition Monster Manual (1977). The larva appeared in second edition in the Monstrous Compendium Outer Planes Appendix (1991), and in the first Planescape Monstrous Compendium Appendix (1994).
A sylph is an outsider that shares many similarities to fey creatures. Sylphs are beautiful winged creatures similar to nymphs that dwell in aerial places. They worship the deity Verenestra.
The sylph first appeared in first edition in the original Monster Manual (1977), illustrated by David C. Sutherland III. It also appeared in second edition in the Monstrous Compendium Volume Two (1989), and reprinted in the Monstrous Manual (1993) under the "elemental, air kin" entry and in the third edition Monster Manual II (2002).