This large goblin mob is surrounded by 4 yellow con (to level 50) "ghostly minion" pets that cannot be attacked (at least not by spells so far as I've seen).
This mob's One Time Drop was ... entirely forgetable. A bracer/bracelet I believe.
95% of the time this mob only drops coins when killed. Extremely rare drops include a Greater Opulence Mythirian (+12% to coin drops earned) and on another ocassion, a Greater Discumbering Mythirian (+80 to encumbrance). There may be additional drops for this mob that I have not yet discovered.