Guardians in Destiny 2 can get Broken Blades from catching Exotic Fish. This is part of a mission to earn the Wicked Implement Exotic Scout Rifle.
Destiny 2: Broken Blade of Ambition, Cunning & Strife explained
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How to find Exotic fish and Broken Blades in Destiny 2 - Polygon
Exotic Quest for Season of the Deep - Step 1 - Exotic Fish
How to find Exotic fish and Broken Blades in Destiny 2 - Polygon
Exotic Quest for Season of the Deep - Step 1 - Exotic Fish
How to find Exotic fish and Broken Blades in Destiny 2 - Polygon
Destiny 2: Wicked Implement Exotic Guide (Exotic Fish and Broken
Broken Blade of Ambition / Vexing Placoderm - Potential Exotic