Thanks! I'll add that the steamwork worker (bronze coloured mob) on the 'stage' in the room right before Tactician (flanked by two of the red coloured 'shockwave trooper' type mobs with a recycler that roams up there) is also a PH.
I suspect that any 'a steamwork worker' on that level is a PH.
Necrotic core is dirt common Crappy aug and Martialism are rares
So far:
15 Necrotic 5 Martialism 3 Augmentations
Spawn rate is abysmal. On a more positive note, this is a decent mob if you have a lot of necro/sk friends. In addition if you set up your camp in the right place, you can also pull the mobs that drop bard/ench, clr/shm, and mag/BL cores if you have a mighty puller and high end (group) dps (whole group having teir 3 group weaponry at least).