NPC Spawn Issue: Invis mob aggro in qcat

[Brut]

Aoe-Hammer says "BOOOM".
Rat popb says "hits YOU for 120s".
Brut says "OUCH NO".

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About loc +449, -162. You can hear it squeak.
Thought first it was a guildmaster from the necro/sk/whatever guilds nearby and was like "wot a stupid name lol".

Erm, wasn't the Polished Steel Dirk supposed to be common drop off the catacomb specs? Killed 12 of em now and none so far.
EDIT: Well, adding a few other things I've noted since can't be arsed to make another topic (sry ><):
- Banker Javen (in catacombs) says, 'Banker_Javen000 at your service for 10 minutes.'
- Broon says, 'spawning droon' (when spawning Droon, soon as he dies... or "spawning proon" if daddy comes up instead)