Will O' Wisp

You summon small motes of white-blue fire that circle an area, briefly flashing across the circle on occasion. This soft alluring light calls to those you choose drawing them towards the center of the circle. Small unintelligible whispers are heard by all.

The creatures inside the area must make a dexterity saving throw or take 3d8 force damage, or half as much on successful saving throw. You may choose any number of creatures within your sight to make a wisdom saving through or be drawn towards the center of the spell, if they pass the wisdom save they are immune to the draw effect of the spell.  The spell lasts for 1 minute with concentration. A creature takes damage at the start of its turn if it is in the sphere or when it enters the area of the spell.

Upcasting the spell increases the damage by (1d8) per spell slot level above 3rd. Upcasting also has the effect of increasing the radius of the sphere at levels 5 (10ft), 7(15ft), and 9(20ft).