Trembera Essence is a material used for the Relay Construction event, which began on August 30th, 2018 on PC and October 4, 2018 on Xbox One and PS4.
Acquisition[]
Trembera can be gained on either Earth, Mercury, Ceres, or Saturn by breaking open containers and killing enemies.
A total of 75 Trembera Essence are required to craft the needed amount of 5 Relay Strut Components.