Cerebral Weave

You conjure a 15ft x 15ft square of psychic flames.

Each hostile creature within the flames when it is conjured take 1d8 psychic damage. If a creature ends its turn in the flames, it must succeed a wisdom save against your spellcasting stat or take 1d6 psychic damage. It cannot use reactions until it ends a turn outside of the flames. Creatures in the flames have disadvantage on saving throws.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you can choose to increase the width and length by 5ft or increase the 1d8 to 1d10 and the 1d6 to 1d8.