Agony

A Thayan spell used during interrogation uses the very energy of life and death to pinpoint the nervous system of a single target in range that you can see and overloads it with terrible signals of pain all without a single mark, wound or blemish.

The target takes 4d8 Necrotic damage or half if they succeed in a CON check against the spellcaster's spell DC. 

Anyone having to save to maintain concentration when hit by the spell does so at disadvantage.

Any target reduced to 0 or less hit points by the application of this spell is immediately stabilized but gains the Unconscious status effect.

This spell has no effect on undead or constructs.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 3.