Umbral Silence

Overview

Umbral Silence is a Legendary Exo Frame upgrade in Heist Battlegrounds that rewards Seraphic Umbral Energy for quick kills. It was added in the Season of the Seraph (December 2022).

Acquisition

The upgrade is unlocked at the Exo Frame through the More Than a Weapon quest. Killing Deathtongue Choristers before they trigger the alarm earns the reward, which is granted when the activity ends. The amount is higher on Legend difficulty. Umbral Silence is a separate source from the Seraph Chest in the same activity.

One source notes that the upgrade was later removed from game data, so check the current patch notes before relying on it.