The First Firewall
From Destiny 1 Wiki
The First Firewall is a level 41 mission on Earth and the first mission in the Sleeper Simulant quest chain. It unlocks after the players have turned in 4 Fusion Rifle Relics (DVALIN-RAS8711-FR00X) to the Gunsmith. The quest was released on October 7, 2015.
After defeating a bunch of Taken enemies and completing the quest, players are awarded with a relic named Curious Transceiver.