Wrath of Baator

Kneeling down to touch the earth below you, you create a small portal through each level of the Nine Hells to allow a piece of the most despicable quality of each layer into your surroundings. This violent tear in the weave causes up to 9 explosions centered on spaces you can see, the radius and damage of which are detailed below. Any creature in the radius of a blast must make a dexterity saving throw against each blast he or she is caught in, taking half damage and suffering no additional effects on a success. In the event that you choose to utilize more than 3 layers, you suffer one level of exhaustion. Should you choose to utilize more than 6 layers, your hit point maximum is reduced by half, rounded down. This effect can only be ended by receiving magical healing of any kind for 5 days. Should you choose to utilize all 9 layers, Asmodeus himself takes particular interest in you and rips your soul from your body, essentially subjecting you to the effects of the Donjon card of the Deck of Many Things.

Avernus. You let the waters of the Styx flow in ten-foot radius sphere, dealing 6d6 acid damage.

Dis. You allow a sphere of malicious psionic energy into your plane, which deals 6d4 psychic damage in a 15-foot radius. On a failed save, affected creatures are stunned until the start of your next turn.

Minauros. You bring forth a small piece of the fetid bogs of Minauros that deals 6d6 poison damage in a 15-foot radius. On a failed save, affected creatures become poisoned until the end of your next turn.

Phlegethos. You force a piece of the roiling magma of Phlegethos into your surroundings, dealing 8d10 fire damage in a 10-foot radius.

Stygia. Your efforts summon a fragment of Stygia's cold, unforgiving waters upon your enemies, dealing 6d8 cold damage in a 15-foot radius. On a failed save, affected creatures are paralyzed until the end of your next turn.

Malbolge. You force a boulder of Malbolge's slopes into this plane, dealing 6d10 bludgeoning damage in a 10-foot radius. On a failed save, affected creatures are knocked prone.

Maladomini. From the necropolis of Maladomini, you bring forth a concentrated area of that plane's negative energy, dealing 10d10 necrotic damage to one creature.

Cania. Icy spikes of Cania's infernal metropolis come forth from a space you can see, dealing 6d8 magical piercing damage in a 10-foot radius.

Nessus. Delving through each layer of Baator, you finally come to the bottom of the pit. From the depths of the Hells, you produce a black flame centered on yourself that does 5d10 fire damage and 5d10 necrotic damage to each creature (including yourself) within 40 feet.