Bill

Bill is one of the six araxyte pets that may be obtained as rare drops from Araxxor and Araxxi. Araxyte pets are very rare drops from Araxxi, although the chances to obtain one may be increased by a player sacrificing their drops in a given kill. After one of them is obtained is a drop, the rest must be unlocked by completing various tasks within the Araxxor fight, after which it will automatically be added to the pet interface. Bill may be unlocked by killing Araxxi after she has absorbed 100% of the acidic spiders that can spawn in phase 3 of the fight. This can be achieved by preventing Araxxor from absorbing any acid throughout the fight, although doing so will allow Araxxi  to deal tremendous amounts of damage.

Like the other pets, Bill shares his design with one of the lesser araxytes that features in the boss fight, in his case an acidic spider or highly acidic spider.