Quickly conjures soul dregs, which slowly home in on the target, dealing 1.0 times the Spell Buff of the catalyst as Dark damage upon impact. Costs very little FP and stamina, and is subject to modification by Faith and Dark bonus on certain specialized catalysts.
The damage that Deep Soul deals is not significant, but the spell is extremely cheap and casts extremely quickly, meaning that it does not require equipping a Sage Ring in order to be useful. As such, it is a very useful tool for harassing opponents, particularly due to its slow and homing nature which is adept at applying pressure.
Multiple Deep Souls can be conjured quickly, allowing for a stream of projectiles homing in on a target before the first one finds its mark.