You summon forth a curtain of darkness that veils all the world in twilight. For the duration, the light of any astral body (sun, moon, stars, etc.) stops reaching the Realm in which you are standing when you cast the spell, plunging it into reddish dim light. Any area that was previously considered dim light becomes darkness. The light from other light sources, such as the light spell or a torch, still function normally. If a creature attempts to dispel this spell via the dispel magic spell, it fails and the creature takes 8d6 necrotic damage.   The only way to end this spell is to destroy the essence of pure light used in its casting.