The target is

You utter the target's name and attempt to bind them for eternity. On a successful save, a target is immune to any future attempts by you to cast this spell on it. On a failed save, choose from one of the forms of bindings below (each lasts until the spell ends).

You infect your target with an arcane disease. At any time after you cast this spell, as long as you are on the same plane of existence as the target, you can use an action to deal 7d10 necrotic damage to the target. If this damage would reduce the target to 0 hit points, you can choose to leave it with 1 hit point. As part of dealing the damage, you may expend a 7th-level spell slot to sustain the disease. Otherwise, the spell ends. The spell ends when you die.

You conjure extensions of your own mental fortitude to keep your foes at bay.

Range: Special (1 mile)

Area: Four 40-foot radius spheres

Scorching spheres of flame strike the ground at 4 different points within range. The effects of a sphere reach around corners. Creatures and objects in the area take 14d6 fire damage and 14d6 bludgeoning damage, and flammable unattended objects catch on fire. If a creature is in the area of more than one sphere, it is affected only once.
 

The target’s body is transformed into a

You utter a powerful word that stuns a target with 150 hit points or less.

You briefly go into a magical trance and whisper an alien equation which you never fully remember once the spell is complete.

Electricity arcs from your hand to shock the target.