Amplified Bio-luminescence emitters:
This modification grows a specialized bio-crystal enshrouded by bio-luminescent organs tweaked to emit specific wavelengths of light; the whole contained in an armored carapace or skeletal cage.
Lesser versions are large enough to require shoulder or back mounted positioning. Greater versions are smaller and can be axially mounted along the bilateral symmetry, or even chest mounted with the most advanced versions. Special psi-active organs mixed in with the emitters provide various supports such as heat management, crystal regeneration, enhanced light production, force effect production, and light beam management functions.
Bio-energy costs are such that a single organism can seldom support more than two such modifications. Some of the elements required to grow the crystal are poisonous to host creatures, which design challenge has been handled with one of two approaches: secondary feeding mechanisms incorporated into the emitter itself (usually only found in the larger and lesser models), or a secondary discreet digestive system for handling the necessary foreign materials.
Behavioral costs include having to train the organism to ingest the craved raw materials in the proper manner to prevent accidental poisoning, until it is mature enough to distinguish the various hunger signals.