Tehom (UA)
Unearthed Apocrypha #1: East of Eden, pp. 7–8.
Level 5 Conjuration (Druid, Sorcerer, Warlock)
Casting Time: Action
Range: 60 feet
Component: V, S, M (a vial of water collected within the last week)
Duration: Concentration, up to 1 minute
A swirling whirlpool of 5-foot-deep water appears in a 30-foot radius centered on a point you can see within range, which 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 starts its turn there must make a Strength saving throw. On a failure, a creature takes 4d8 Bludgeoning damage and is pulled 15 feet toward the center of the whirlpool. On a success, a creature takes half as much damage and is not pulled.
If a creature begins its turn at the center of the whirlpool and fails its saving throw, it immediately disappears and is magically teleported to the exact spot from which you collected 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 this spell for the full Duration, vanished creatures do not return.