It's called maidens kiss and if i remember, it casts Beserk, haste and something else on the target. I read it can be used to Beserk Omega, even though Omega is immune to Beserk. I guess it works on everything.
If you Beserk something, after effects don't take place. For example, you can beserk alta roit (the 6 mage bosses in the dungeon to X-deaths Castle in the cleft of dimension) and they won't take their dragon form when they die.