Call of the Void

The caster points to a target within visual range and a bullet of shiny black energy goes streaking towards the target, surrounding them in a vague black mist for a moment. 

The target must make a wisdom saving throw against the spellcaster's spell DC + half of their spell attack modifier.

On a successful save, the target takes 2d10 psychic damage and is knocked prone for a minute. On a failed save, the target is compelled to injure themselves in any way available (leaping from a cliff, walking into an enemy's weapon, dropping protection spells, any means detrimental to themselves), almost coerced into it by a whisper voice that is known as The Void... it tries to persuade the target to self-destruct, essentially.