Bite

You sink your teeth into a target creature. Make a melee attack roll, doing 1d10 + MOVE dark damage on a successful hit. On natural attack rolls of 19 or 20, the target flinches

At Higher Levels: The damage dice roll for this move changes to 2d8 at level 5, 5d4 at level 10, and 4d8 at level 17.

Optional Rules:

Instead of a natural roll of 19 or higher, the target must make a CON save against your MOVE DC. On failure, the target flinches.