8 1 0For this I used Havoc shards to fill my havoc meter....At half of Lust's health Usiel shows up. Ignore him for obvious reasons. if he takes some dmg don't worry about it since Lust is at 50% and you should be focusing her it shouldn't matter if he gets cleaved.Use your Havoc form with LB+RT and make sure to lock on to Lust then just go ham on her until it runs out. When it runs out just try and stay away from them until you can use a shard again which should be pretty soon after... from half health it should take about 3 shards maybe more. It took 3 for me with a few pokes without it. I also played on NORMAL.