How to gain furies after reaching 15 with Sabretooth?

Sabretooth can convert all his furies to passive furies UNDER 15 passives, and I know he gets passive furies when he throws a special 3 to end the fight, ann there is a cap at 30 i believe, are there any other ways?
Post edited by Kabam Zanzibar on
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edit: i believe this is what you're looking for