You open a flash portal into the Abyss, tainting the world with its madness. Choose a point within range; creatures within 10 feet of that point must succeed on a Constitution saving throw (which they may choose to fail) or be affected by a random option from the Alter Self spell for 1 hour, no concentration required. To choose the effect, roll 1d4:

1. Aquatic Adaptation
2. Change Appearance
3. Natural Weapons
4. Roll twice, disregarding any future 4s

The rift warps the surrounding area for 1 hour by causing plants to grow spines, or stones to melt into sticky puddles; any surface within 10 feet of the portal becomes difficult terrain for 1 hour.