You create a 10-foot-diameter magical circle and enchant the obsidian within it, shrouding the surrounding area in endless night. The spell creates a dome with a 3-mile radius centered on the circle. Natural light from outside the dome can't enter it, leaving the area in darkness like that of a moonless night. The effect can't be dispelled by dispel magic. Magical light created by a spell of a level equal to or lower than the level at which you cast eventide can't illuminate the area. Nonmagical light sources, such as candles and torches, function normally. If the magical circle is destroyed or the obsidian is removed from it, the spell ends.

Using a Higher-Level Spell Slot. The radius increases by 3 miles for each spell slot level above 7.