Selling: Wts 3x Hardening Nano Adjuster A01 used for vigilante modified upgrade

Sorry but when and wth did U loot these off of??
And which ones may I ask?
Medusa Fort event Warlock boss. (Hydra?)
Also seen during other events which spawn that mob. Last one I personally saw looted was at Calypso Boss Wave event.

For the Medusa Fort, enough mobs in the area must be killed to trigger the event. (a lot)