The Acolytes ploughs through the ork lair with autogun and bolterfire. Squig, snotlings and ork bits all over the place. Nothing dangerous happens except when a guard throws a grenade into a lake of heavy petrochemical.
After wandering murdering through the lair for a bit, the team encounters the mek boys and their assistants and bring the fight to them.
Now only the nob and his boyz remains.