New Cantrip: Lick/Tentacle of Necrosis

Necromancy cantrip
Casting Time: 1 action
Range: 10 feet
Components: V, S
Duration: Instantaneous
A horrifying tentacle/tongue spawns from your arm and licks your opponent/A horrifying tentacle/tongue sprouts from the ground and with much slime wraps around your opponent. Your opponent takes 1d8 necrotic damage and is knocked prone. This effect is negated on a successful strength saving throw.
5th: 2d6
11th: 3d6
17th: 4d6