The Division 2 has just released its second expansion called Battle For Brooklyn, which brings agents back to New York for several new missions and offers a new Exotic gear piece. Here is how to get the Catalyst Exotic mask in The Division 2.
How to Unlock The Catalyst Exotic Mask in The Division 2
you may get the Catalyst Exotic mask byrepeatedly completing the last mission of the Battle For Brooklyn DLC. The Battle For Brooklyn expansion is a paid DLC that must be installed with the Brooklyn area found at the top of the Washington D.C. map.
The final mission of the DLC is calledArmy Terminal, which ends with players fighting a Marauder UAV while trying to take down a zeppelin. The Catalyst mask can drop from completing the mission, but it is not a guaranteed reward.

However,playing Army Terminal on higher difficulties will increase the chance of the Catalyst drop. So, it is best to play on the Heroic difficulty alongside a team for the best chance to unlock the Exotic mask.
Catalyst Exotic Mask Stats in The Division 2
TheCatalyst Exotic maskcomes with a core attribute of Weapon Damage alongside secondary attributes of Status Effects, Hazard Protection, and a mod slot for gear mods. It also deals the following effects when equipped:
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