"One of the first missions we ran with the rebels was a raid on a Sylphid lab," Layla says, expression hardening at the memory.

"They were experimenting on people, trying to find a way around the immunity. Not just drug regimens, either, which means it can't just be some psychic thing they want to suppress. Which means it probably would be replicable, if it could be pinned down. Which is definitely not my area."