You point the tooth at a creature within range. Make a ranged spell attack against the target. This attack always hits if the target is submerged in water. On a hit, the target takes 1d10 piercing damage. Whether your attack hits or not a 15-foot-radius whirlpool appears centered below the target. The water is 10 feet deep and is considered difficult terrain. If the attack hit, the whirlpool remains centered on the target no matter where or how it moves.
At the end of the targets following turn, a gargantuan maw rowed with razor sharp teeth appears and attempts to bite all creatures in the whirlpool's radius. All creatures in the area must make a Dexterity saving throw against your warlock spell save DC to avoid the snapping maw. The target of this spell makes this save with disadvantage if the attack hit. If a a creature fails, it is dragged into the maw and bitten, taking 4d10 piercing damage and 4d10 slashing damage. If this is enough to reduce the target to 0 hit points, you can choose to have them be swallowed whole by the mouth, consuming them and sending their bodies to Suulo. Either way, the maw then immediately disappears.
At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the piercing damage (from the maw) or the slashing damage (your choice) increases by 1d10 for each slot level above 5th.
* - (Chasm Wraith Tooth)