Tear Space

Tear the fabric of spacetime, creating a portal that connects to other planes and unleashes devastation in a chosen direction. Choose a space that you can see to create a portal that is 15ft wide and 25ft tall, facing a direction of your choice (portal can be suspended above ground but must be in open space). Next, roll a d4, and depending on the result, a random effect will occur (see table below for effects). While this spell is active, you can choose to reroll the portal's effect using a Bonus Action on each subsequent turn after the spell is cast, until the spell ends.

1.  If you roll a 1, three Beholder eye stalks, bathed in a 100ft cone of chilling antimagical light facing outward from the portal, will emerge from the Underdark. The eye stalks will shoot three random magical eye rays every turn, their effects taken from the list present on the Beholder stat block. These rays will target any random creature(s) within the antimagic cone and none outside of it. 
2. If you roll a 2, countless thorned, twisting vines from the ravenous Feywilds will emerge from the portal, clawing at any creature(s) in their path. Every turn, all creatures within a 60ft long by 15ft wide area facing outward from the portal must make a DC 18 Dexterity saving throw. On a failed save, creatures take 6d10 piercing damage and are both Poisoned for 2 turns and Restrained until their next turn or until the vines disappear, or take half damage and suffer no other effects on a successful one. Any creature(s) Restrained by these vines will suffer an additional 3d10 Slashing Damage upon the condition ending.
3. If you roll a 3, viscera and foul blood from the River Styx in the Hells will rain from the portal in a great torrent, coating all creatures in a 150ft cone facing outward from the portal in boiling fluid. Every turn, any creature(s) within the cone must make a DC 16 Constitution saving throw. On a failed save, creatures take 4d10 Fire Damage, are Blinded and Poisoned, and are affected by a random disease from the Contagion spell lasting 1 day, or take half damage and suffer no other effects on a successful one.
4. If you roll a 4, a surge of divine light from the Celestial planes will be cast in a 300ft cone facing outward from the portal. This light is considered Difficult Terrain, and all creatures beginning their turn in the cone will automatically be Blinded and will not be able to turn invisible until they leave the cone, and must make a DC 16 Wisdom saving throw on every turn within the cone. On a failed save, creatures have their Wisdom score reduced by 2 (to a minimum of 1) until their next Long Rest and are compelled by the portal, able to do nothing on their turn except walk towards it. If any effected creature(s) reach the portal, they will take 10d10 Radiant Damage and have all of their ability scores reduced by 5 (to a minimum of 1) until their next Long Rest. On a successful save, creatures suffer no effects. Creatures who have a Wisdom score of 1 automatically succeed this saving throw within the cone.