Vexcalibur Expert Authorization Override

Vexcalibur: Expert Authorization Override is the third quest in the NODE.OVRD.AVALON Exotic mission chain in Season of Defiance, given at the War Table in the H.E.L.M. It follows the basic Authorization Override and has four steps: quickly defeat Vex while wielding Vexcalibur to acquire the Expert Authorization Override mod, equip that mod to Vexcalibur, solve one mystery in the AVALON node and destroy Brakion in its final encounter, then return to the War Table for an incoming transmission. Completing it rewards the Expert Authorization Override mod and a Defiant Engram.