You can get this quest from the Office of Vermin Control, located in the Great Bazaar (look right outside Chirper's side entrance).
Details[]
Level: 2-4
Skills used: Trivial combat.
Walkthrough[]
Inside the Office of Vermin Control, the unhappy Kaiyetan the Rat Catcher offers a bounty to kill a Big Cranium Rat, assumed to be hiding and planning in the sewers just below. Accessible by a cellar doorway in the Office and through a bricked archway, the Big Cranium Rat in question is found anywhere within the Market Ward Tunnels roaming about with other Cranium Rats in tow; once killed you can bring it's carcass back to Kaiyetan the Rat Catcher for 150 jink and some XP.