[Snake]

I don't know if it's called 'Forbidden' because it's dangerous to use, or because it's a complete bait of a potential skill. I do have a suggestion on how to make it better or at least more interesting, hopefully.

Dagger's Potential Skill: Inflicts you with Cursed Vengeance LV10 for 5 rounds.

"Cursed Vengeance - Every round, your HP will be drained by 10%, and LV will be increased by the amount drained. Performing a basic attack will use this status to increase its Power by LV, but you will take 50% of your basic attack's damage as protection-ignoring Retaliation damage. (Taking damage from enemies will also increase LV by the damage taken.)"