The Worlds of Light and Dark

The World of Light and World of Dark are two planes of existence could be considered "adjacent" to the material plane in the Sea of Dreams. These planes are believed to be the source of positive and negative energy respectively in the Material Plane. The reason is either unknown or long forgotten but the land of Esor seems to be especially close to these planes, dimensional speaking. This closeness manifests most obviously in the Dawnborn and the Duskborn that have started to appear within the ranks of the Absit Settlers. The reason that these side effects seem to only affect humans stems from the same legend of their origin on the Material Plane. That legend being that humans are actually the crossbred children of entities from the World of Light and the World of Dark, born on Esor. Both planes overwhelmingly radiate their respective type of energy. This can be dangerous even for nonnative beings that benefit from that type of energy, making spending time on either plane potentially lethal.

World of Light Planar Effects

 * Positive Radiance: Each round, any creatures that are not native to the Plane of Light take 2D6 positive energy damage each round. A Will save of DC 20 halves this damage. Living creatures are healed by positive energy and undead are harmed by positive energy but the overwhelming nature of the power can even be dangerous to living creatures. A living creature that is at full hit points takes this positive energy as damage and this damage can't be healed from sources of positive energy.

World of Dark Planar Effects

 * Negative Radiance: Each round, any creatures that are not native to the Plane of Dark take 2D6 negative energy damage each round. A Will save of DC 20 halves this damage. Undead are healed by negative energy and living creatures are harmed by positive energy but the overwhelming nature of the power can even be dangerous to undead creatures. An Undead that is at full hit points takes this negative energy as damage and this damage can't be healed from sources of negative energy.