Tried it in Umbral plains on several mobs i had previously had trouble slowing. I used unresistable disease debuffer ahead of it and had it resisted so it does get resisted at 57. Spell is not useless but very near it. If you are using it as a slow and it takes and you get several adds you can't mez you can't go back and mez the orignal pull if you used this because he will be dotted.