The way this Build works is that you'll use Sacrificial Axe in your offhand and Starscourge Greatsword in your right. When you dual wield the Starscourge Greatsword, since it's a paired weapon, you will still technically have the Axe equipped, which will provide you 4 FP every time you kill an enemy. This allows you to use Starcaller Cry more liberally, which is great.

Starcaller Cry should be used on large groups of enemies since it has a huge AoE radius, and can often one shot weaker enemies. Make sure you use the follow up attack to finish off tougher to kill enemies, since it does far more damage than the cry itself.

Jump Attacks can be used on lone enemies or on Bosses that you struggle to perform Starcaller Cry against. Remember to start the cry when bosses are just on the edge of the AoE to give you time to pull off the follow up attack without being interrupted. Your armor does have good Poise, but some bosses hit really hard.