Hex [V] [S] [M] (eye of newt)

Duration: Concentration, up to 1 hour
Range: 90 feet
—
You place a curse on a creature that you can see
within range. Until the spell ends, you deal an
extra 1d6 necrotic damage to the target whenever
you hit it with an attack.
Also, choose one ability when you cast the spell.
The target has disadvantage on ability checks made
with the chosen ability.