I've camped this on and off for about 18 months, just one of those NM's that stay pretty far down on my list unless I'm really bored, well tonight I was really bored.
FINALLY popped him tonight. Killed stuff on and off for 8 hours and never saw a double-earth (even popped Tungi NM twice out of boredom). Finally get my double-earth and I rush over here, just kill the one in the hallway. No pop, still weather. Kill the hallway again, decide to kill the one in the room too (just in case....even though this thread says it's the corridor)
The one at the end of the hallway pops right at his home (still 2x weather), I work on killing him but doubtful it'll stay 2x earth for another pop, it had been 45 minutes. Well the second I kill him (16m from my kill on the second) Diamond pops. Just to clarify he popped out in the hallway, not in the room where his PH was.
This might just mean that either beetle can be a PH, but in all the time I've camped this over the last year (60+ hours easily), I've killed only the hallway pop and it's never popped.
Got drop, 16 minute kill (beetle popped in the hallway as he died haha) as RDM/NIN. Bio2/Poison2 did most of the damage. Melee with Blau/Esword/Joy (traded Blau in for Energy Drain) did about 10+19 each, shining blade is your best WS as at 100TP mine was doing about 200-240 with esword. Didn't convert, I was never in danger as he's kinda blind.
I sure hope this is 100% drop, I honestly think this is probably one of the rarest items on the server. I have never ever seen another player camping this, ever.