Mabar, the Endless Night

Mabar is the darkness that promises to swallow even the brightest day, the hungry shadow that yearns to consume light and life. It is the plane of entropy, hunger, and loss, slowly sucking the life from the multiverse. It is the source of negative energy in Eberron. Most undead are animated by the power of Mabar, and the life they drain from mortals flows into the Endless Night.
Mabar is made up of many fragments, each one representing a different vision of desolation. The fiends of Mabar scheme to steal fragments of other planes and draw them down into their eternal darkness, creating a jumble of broken worlds in varying states of decay.

Mabar Manifest Zone Features
d4 Feature
1 Undead animated here have 2 extra hit points per Hit Die and make saving throws against being turned or frightened with advantage.
2 Vegetation here is sour and stunted, animals are stillborn or deformed, and a malaise hangs in the air.
3 On nights during the month of Sypheros, when the Shadow Moon is dominant in the sky, horrific monsters stalk the area, prompting residents to leave offerings outside their doors to ward off the evil.
4 The radius of any light source in the zone is halved, and saving throws against necromancy spells are made with disadvantage in the zone.