The forces at Onslaught Harbor are heavily reinforced by gryphon riders. You need a mount that will enable you to put them down. But first, we need the components for the ritual that is going to make it all happen.
A great deal of blood is necessary for the ritual to be undertaken.
<The lord-commander points down and to the northwest.>
There is a readily available supply down there in the harbor... sharks. Do not return to me until you've filled this bladder with their blood.