Cancer

Notes:
 * Located around H-7 on the first map
 * Either a lottery pop of Robber Crabs, or spawned randomly by trading a Quus to the ??? there. Mostly it seems to spawn a Robber Crab, and ever once-in-a-while it spawns Cancer.
 * The drop rate on the Arondight appears to be very low.
 * High resistance to physical damage, so magic damage is useful.
 * Killable by 6 level 65 players

Historical Background
In Greek mythology, Karkinos (Greek "crab") or simply an unnamed crab, was sent by Hera to attack Hercules while he was fighting the Hydra. There are varying accounts of its size in this story, some depicting it as a regular sized crab, others as a giant crab. Regardless, it ends up being crushed by Hercules. Hera memorializes the creature's efforts by placing it in the sky as the constellation Cancer. Cancer is the Latin word for "crab".