Astlyr's abilities have no cost related to them, and the use of her abilities is only limited by cooldowns. Instead she uses Fury as her secondary resource. Astlyr starts with 0 Fury, and has a cap of 100 Fury. She gains 5 Fury per autoattack, plus 5 extra Fury per critical strike and 10 extra Fury per any unit she kills. When out of combat for 5 seconds, Astlyr loses 5 Fury every second.