Jaxa was a former Time Agent, whose primary responsibilities included going back in time to recover material from the past that had been lost during archival clear-outs.
Sabbath hired Jaxa for his crew when she nearly suffocated while travelling to a lunar colony after she materialised three decades before the colony would be founded. She was apparently killed when Jonah Cosgrove shot her while she was materialising from a teleport; while her suit was bulletproof, Cosgrove managed to shoot her at just the right time for the bullet to materialise inside her. She was sent back to their home by Roja in the hope that she could be saved, although he acknowledged that it was unlikely. (PROSE: Trading Futures)