When your healer is busy elsewhere or you are soloing Ragnarok zeny.
The extra damage this will allow you to do without having to constantly switch targets is wonderful, and again this can help keep you alive when your healer is busy elsewhere or you are soloing Ragnarok zeny. This is a powerful tool, but make sure you know when to use it and when it would be best saved for another time. Just be able to recognize the difference between your party needing a break and your party being about to finish the enemy off, or you may end up with some unhappy people chasing after fleeing targets. If you use your talent points you can reduce the casting time to 1 second, the casting time will bypass any melee swing timer. This is best when you are in a group with multiple tanks and you are planning on staying in Berserker Stance.