Succubus/Incubus suggestion

[Former user]

Instead of them having an attack that instantly drains levels, give them:

(a) an enticement attack that increases player lust slightly and temporarily lowers player willpower (b) a seduction attack once the player's lust is high enough and willpower is low enough that is more powerful the higher the lust, but can be resisted by high willpower. Failure to resist causes loss of XP (c) if the XP is already zero, lower the player's willpower instead. (d) if the player's (temorary) willpower drops to zero, knock them out and reduce their level.

Overall this would give them a unique attack that reflects them seducing the player instead of knocking them out.