History of Taken Barrier

Taken Barrier is a Last Wish raid mod in Destiny 2, not an armor set bonus. While it is equipped, taking damage from a Taken enemy grants 20% damage reduction for 10 seconds. The mod drops randomly in the Last Wish raid, and its effect only works inside that raid.

The wiki notes that it was originally an Outlaw armor mod before Beyond Light, and lists it as a Season 4 Common mod.