Curses

[ArkhanTheBlack]

Is there a way to remove a curse?

[Sawyer]

Nope.

[Argitoth]

Nay.

[NTJedi]

A curse is FOREVER.

A horrormark technically has a way out according to KO. Apparently one level of horror mark is removed anytime the unit dies during a battle against a horror. Unfortunately most attacks from horrors include astral claws which add extra horror marks.
Perhaps scripting the horror marked pretender or immortal to cast immolation at the start of battle as it hides in a castle waiting for the horror attacks?

[chrispedersen]

Does Ritual of rebirth retain a curse?
How about polymorph by wway of lycanthropy?

[Edi]

FAQ. A curse is PERMANENT. That's because it's not tied to monster ID, but the unique id of the cursed unit. No matter what you do, you can't get rid of it.