Chance

A glowing square appears on the ground, each side 15 feet. Roll a d20. If the result is an even number the caster chooses something to appear in the space if the DM approves. For example, the DM might allow a magic item such as a Flame Tongue, but not an Amulet of the Planes. If the result is an odd number something appears in the space, but the DM decides what. This spell can summon creatures with a challenge rating higher than 10, and can't create legendary magic items. If the result is a 1 the spell summons a creature with an evil alignment and a challenge rating of 20 or higher. If the result is a 20 the spell allows the caster to cast the Wish spell once.