Extraplanar refers to a monster 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. Creatures not labeled as extraplanar are natives of the Material Plane of Eberron, and they gain the extraplanar subtype if they leave it.
Extraplanar creatures include:
- Any of the various outsider type monsters EXCEPT Native Outsiders
- Air Outsiders (native to the Elemental Plane of Air): Air, dust, and ice mephits
- Earth Outsiders (native to the Elemental Plane of Earth): Salt and sand mephits
- Evil Outsiders*: Demons*** (native to Shavarath and the Abyss), Devils*** (native to Shavarath and the Nine Hells of Baator), Efreet (native to the Elemental Plane of Fire), Daelkyr (native to Xoriat), Hellhounds (native to the Nine Hells of Baator), Night Hags** (native to the Gray Wastes of Hades), Salamanders (native to the Elemental Plane of Fire), and Yugoloth (native to the Gray Wastes of Hades and Gehenna)
- Fire Outsiders (native to the Elemental Plane of Fire): Fire mephits
- Good Outsiders: Bralani Eladrin, Ghaele Eladrin
- Beholders (native to Xoriat)
- Elementals (native to the various elemental planes)
- Monsters with Fiendish blood. Fiendish Trolls, Gnolls, and Troglodytes
*Tieflings are not considered extraplanar in DDO, even those classified as evil outsiders. Quori are also not considered extraplanar, but technically they should be when encountered outside of dream-states. Rakshasa are not considered extra planar either, possibly because many have migrated to the material plane.
**Other types of hag are considered Monstrous Humanoids and so are not extraplanar.
***In Shavarath, devils and demons are not extraplanar and cannot be banished.