After the Reactor Drive was set above Lahai-Roi by the Exostrider, it remained on high alert to the activities of Aleph-1.

When the Drive's immune response is triggered, a mechanized "Reactor Husk" will arise from the depths of the energy well, with the sole purpose of eliminating intruders at all costs.

Research by Spacetrek Collective shows that Reactor Husk was once part of the Exostrider. Both share a mission to resist the Threnodian threat and safeguard civilization.