Renekton's abilities have no cost related to them, and the use of his abilities is only limited by cooldowns. Instead he uses Fury as his secondary resource.
Renekton starts with 0 Fury, and has a cap of 100 Fury. He generates 5 Fury per autoattack, and gains more for non Fury-enhanced ability usage; 5 Fury for each enemy hit by Šablóna:Ai, and 10 Fury for an attack enhanced by Šablóna:Ai. When Renekton has not dealt or taken damage for 12 seconds, he loses 5 Fury every 2 seconds. If Renekton's Fury reaches or increases beyond 50, casting one of his basic abilities will consume 50 Fury to empower it with bonus effects.