Circle of Summoning

You draw a 10-foot-diameter circle on the ground inscribing it with symbols and runes that amplify the presence of outsiders. As a part of casting the spell, choose one type of
outsider; aberration, celestial, elemental, fey, fiend or undead. When a spell is cast that summons creatures of the chosen type into the area of the circle, you can use your reaction to
extend the duration of the spell by up to 8 hours.

You can create a permanent circle of summoning by casting this spell in the same location every day for one year. You need not use the circle of summoning when you cast the spell in this way.