Blackout Construct Residue

 is a rare catalyst which can be used in the process of upgrading Adaptive Augments related to the Metal Part II episode.

Obtained from

 * Metal Pt. II: Batscape
 * Metal Pt. II: Damage Control
 * Metal Pt. II: The Phoenix Cannon
 * Metal Pt. II: Into the Dark Multiverse

Trivia

 * Three pieces of Blackout Construct Residue are needed to breakthrough milestone rank 15 of an augment.