Fell Callers are powerful Trollkin warriors boasting voices capable of shattering stone and making the sky itself tremble, and Grissel Bloodsong has singular mastery of this ability. She wages a personal war against the enemies of the Trollbloods as an icon among her warravaged people. With her deafening hammer Resounder in hand, she serves as an inspiration on the battlefront, prompting even the battleweary to resume the fight and follow her lead.