Hex

You place a curse on a creature within 90ft.
Until the spell ends, you deal an extra 1d6 necrotic
damage to the target whenever you hit it with an
attack. The target has disadvantage on ability checks
made with an ability of your choice.

If the target drops to 0 hit points before this spell
ends, you can use a bonus action on a subsequent
turn of yours to curse a new creature.

A Remove Curse cast on the target ends this spell.