Took a serious shot at a 5* mostly to gauge how much I need for these.. Managed to take down Quetzal. Had some issues breaking rage because I didn't have anything with single high multipliers - had to get all my buffs up and nearly full chain count, but once it got there Kelger and the 6* Ninja Earth skill tore him down pretty quick. ~35 second kill, and I'm pretty sure it can be made sub30 if I figure out how to better optimize action orders and the Entrust sequence.