Hex (Warlock 1)

When you cast Hex, choose an ability.
Enchanted creature has "+1d6 necrotic damage whenever you hit it with an attack" and "disadvantage on ability checks made with
the chosen ability" for up to 1 hour.
If the target drops to 0 hit points before this spell
ends, you can use a bonus action on a subsequent
turn to move Hex to a new creature.