Bytopia

The two layers of the Twin Paradises of Bytopia are similar yet opposite: one is a tamed, pastoral landscape and the other an untamed wilderness. Yet both reflect the plan’s goodness and its acceptance of law and order when necessary. Bytopia has two layers, stacked on top of one another, but facing each other. Down is whichever ground you’re closer to. The tallest mountains on each layer touch at their peaks making it more like a column. During the day, the plane is lit by radiance from the sky. When nighttime comes, the light fades and the sky becomes dark. What look like stars overhead are actually the lights of fires of communities on the other layer.

At the end of each long rest taken on this plane, a visitor that is neither lawful good nor neutral good must make a DC 10 Wisdom saving throw. On a failed save, the creature’s alignment changed to lawful good or neutral good (whichever is closer to the creature’s current alignment). The change becomes permanent if the creature doesn’t leave the plane within 1d4 days. Otherwise, the creature’s alignment reverts to normal after one day spent on a plane other than Bytopia. Casting the dispel evil and good spell on the creature also restores its original alignment.