Blade Dance: Griffon's Nest

You summon a teleporter magic circle which affects a 10-foot radius sphere originating from you at time of casting. Any creature entering or exiting this area counts as leaving your reach for the purposes of Opportunity Attacks. Any creature in the sphere radius count as being at range for the purposes of making Melee Attacks. If you leave the sphere, the spell ends.

Using a Higher-Level Spell Slot. The area of the sphere increases by 5 feet for each spell slot level above 2.