History of Adrenal Rush

Adrenal Rush is the 2-piece bonus of the Cyberserpent Null armor set (see Cyberserpent Null Mask), earned from Gambit. It improves reload speed and handling for a short time after sprinting, and final blows extend it. Bungie permanently disabled the set's 4-piece bonus in the Crucible over an ammo exploit; reports say Adrenal Rush still works in PvP and the full set in PvE.