History of Target Lock

Target Lock is a trait weapon perk introduced in Season 19. It makes "damage increase the longer this weapon remains on a target." Its maximum damage bonus is about 25%, reached after firing a full magazine on the target.

The Immortal

The Immortal (Adept) can roll Target Lock.

Barrow-Dyad

Barrow-Dyad has a Target Lock catalyst, Target Lock Refit. For PvE, the usual pairing is Taken Ambition with Target Lock.