The Commorb is a members-only quest item obtained during the Wanted! quest from Sir Tiffy Cashien. It can contact someone named Savant inside it. Savant helps player during quests Wanted! and Slug Menace.
Sir Tiffy will make you a Commorb for 10,000 coins or for one law rune, one enchanted gem, and one molten glass.
The commorb can be upgraded after starting the Slug Menace quest to the commorbv2