Mabar, the Endless Night is a plane in the cosmology of the Dungeons & Dragons setting of Eberron, commonly nicknamed "The Orrery". Utter blackness where no light shines fills the plane of Mabar. The starless night lasts forever, its gloom never diminishing in the least. The darkness literally devours the life of visitors to this plane, extinguishing every spark of light that dares intrude on the endless night.
- Minor Negative-Dominant
- Enhanced Magic: Spells that use negative energy, including inflict spells, are maximized.
- Impeded Magic: Spells that use positive energy are impeded.
- Mabar Inhabitants: Barghest (all), Bodak, Succubus, Nightshade (all), Shadow, Shadow Mastiff, Xeg-yi, Yugoloth (all), Gloom Golem, Necronaut, Trilloch, Vasuthant.
- All of the creatures listed above are immune to the effects of negative energy, including the ambient effects of this plane.
- Coterminous: When Mabar is coterminous, every shadow grows darker and colder, and the nights become far deadlier. Spells that use negative energy are cast at +1 caster level, if cast in darkness, and evil clerics rebuke or command undead as if they were one level higher as long as they are in darkness. During the night and while underground, travel between the planes is much easier – simply stepping into an area where no light shines can transport you from Eberron to Mabar, and Barghests and shadows emerge from the endless night to hunt the nights of Eberron. Mabar is coterminous for three dark nights once every five years, on the nights of the new moon closest to the winter solstice.
- Remote: When Mabar is remote, shadows seem a little lighter and the nights are not so fearsome. Spells that use negative energy are cast at a –1 caster level and evil clerics rebuke or command as if they were one level lower. Mabar is remote for a period of five autumn days once every five years, around the full moon nearest the summer solstice, two and a half years after each coterminous phase.