Currently the Stryll Pathogen (200 bonus to planetary invasions for 2 days. Costs 5 energy to use.) is only dropped by the Sketh, Stryll Predator, which is shared form levels 60-180. (
http://galaxylegion.com/wiki/index.php/ ... l_Predator)
I would like to see those artifacts incorporated into the drops of the higher level Stryll rares/elites like the Svax, Stryll Punisher (rank 100) and the Xavox, Stryll Punisher (rank 300) each of which currently only drop a single planetary research artifact.
It could also be an uncommon drop on the Uncommon Stryll Desolator (rank 400) which now only drops a seeker artifact.
I wouldn't even mind seeing it in the Graxis, Stryll Prison (rank 240)- although I don't relish the thought of fewer chances at the Rescued Stryll Prisoners.