Viridian VC, secret mission - there is quite an annoying issue with this mission. Unless you have some kind of general on-demand explode skill, or a bag full of grenades, you can't access the teleport to the secret room. And since this purge missions seems to be counting mobs in the secret room towards the mission requirement, it's a wee bit complicated for TA and other poor sods stupid enough to not roll a psyker or crusader for their seasonal character to actually finish the mission.
I get it, Neocore devs design this game for psykers and crusaders. We all know that as long as psykers can blast through a mission, everything is fine in the devs' view.
But it would be nice for the devs to occasionally test the game with other classes as well, not just psykers and crusaders - if only to figure out whether you can, you know, actually finish missions with all the classes and weapons in the game...
Edit: ah, sorry - the mission is actually the bonus mission in the top-right corner, not the secret mission.