You bestow a curse upon a creature you touch.

You touch a creature, and that creature must succeed on a WIS saving throw or become cursed for the duration of the spell. When you cast this spell, choose the nature of the curse from the following options:

• Choose one ability score. While cursed, the target has Disadvantage on ability checks and saving throws made with that ability score.
• While cursed, the target has Disadvantage on attack rolls against you.
• While cursed, the target must make a WIS saving throw at the start of each of its turns. If it fails, it wastes its action that turn doing nothing.
• While the target is cursed, your attacks and spells deal an extra 1d8 DARK damage to the target.

A Cursna spell or similar ends this effect.

At the DM's option, you may choose an alternative curse effect, but it should be no more powerful than those described above. The DM has final say on such a curse's effect.

At Higher Levels. If you cast this spell using a spell slot of 4th level or higher, the duration is Concentration, up to 10 minutes. If you use a spell slot of 5th level or higher, the duration is Instantaneous (so it can no longer be dispelled or affected by anti-magick abilities), and curse lasts for a specific amount of time. At 5th level or higher, it lasts for 8 hours; at 7th level or higher, it lasts for 24 hour; at 9th level, the curse lasts indefinitely.

Using a spell slot of 5th level or higher grants a measure of protection against Cursna and other similar effects – these effects can only remove the curse if it is cast at an equal of greater level than the curse effect.