You go into the lost to light mission when it is the daily heroic mission. You have to go through the mission without wiping till you get back to the room with the hive seeder that has the locked door which requires three husks to open. Ignore the husks and go directly across the room and you'll see the door leading to the tankis strike open. Follow the way to the ship and in, when you get into the first open room you'll have a timer for 10 minutes appear, fight through like playing that strike before the timers goes out and you'll get it.