Tehom
This is the version published in Silk Road's Guide to Seafaring. View the existing Rules version.
5th-level Conjuration
Casting Time: 1 action
Range: 60 feet
Components: V, S, M (a vial of water taken from any body of water, which this spell consumes)
Duration: Concentration, up to 1 minute
Classes: Druid, Warlock A swirling whirlpool of 5-foot-deep water appears in a 30-foot-radius centered on a point you can see within range. The point must be on the ground or in a body of water. Until the spell ends, that area is difficult terrain, and any creature that enters it for the first time on its turn or ends its turn there must make a Strength saving throw. A creature takes 4d8 bludgeoning damage and is pulled 15 feet toward the center of the whirlpool on a failure. A creature that succeeds on its saving throw takes half as much damage and is not pulled.
If a creature begins its turn at the center of the whirlpool, it must immediately repeat the saving throw. On a failure, it disappears and is magically teleported to the exact spot from which you drew the vial of water used as the material component of the spell. The target remains there until the spell ends, at which point the target reappears in the nearest unoccupied space to the one it left.
If you maintain concentration on the spell for the full duration, vanished creatures do not return.
Source attribution and license
Silk Road's Guide to Seafaring, printed pages 192.