Dead Calm

Said to be a spell concocted by Seris Apraxa herself, the power of such calm instills fear and death even in the hearts of angels. A slow moving orb of featureless black energy appears at a point within range. The orb is 5 feet in diameter and can occupy another creature’s space. Light bends around it and a zone of utter silence surrounds it in a radius of 30 feet; this effectively blocks verbal spell components. The orb moves 15 feet each round of combat, never stopping, though you can determine which direction it moves as a free action on your turn, and as a reaction.

Any creature that comes in contact with the orb for the first time on a turn that has fewer than 30 hit points dies instantly, and their soul is absorbed; if not then they must make a Constitution saving throw or take 10d10 necrotic damage, or half as much on a save. A creature that is damaged by this effect has their hit point maximum decreased by the damage done. Their hit point maximum can be restored via an equally powerful remove curse or greater restoration.

For every soul absorbed the orb gains an additional 5 feet of movement. This spell consumes all material components.