Ghoul Pet

The Ghoul Pet is a Pet dropped by Crypt Ghouls near the Graveyard, one of four pets obtained from mobs used in slayer quests. The other three are the Hound Pet, the Tarantula Pet and the Enderman Pet. The chance of one dropping is 1/25000 without or.

The Ghoul Pet's second ability, Zombie Arm, also applies to the Ornate Zombie Sword and Florid Zombie Sword, which are upgraded versions of the Zombie Sword. This makes the Pet viable for Healer/Tank hybrid builds (especially if the Tank has a Reaper Scythe).

Obtaining
In order to obtain the Ghoul Pet, head towards the cave in the Graveyard near the Coal Mine. The Ghoul Pet can be dropped by killing the Crypt Ghouls inside of the cave. This pet is a super rare drop from the Crypt Ghouls.

The Pet has a 1/25000 Drop Chance (confirmed from looking at mob drops in bestiary) (1/33333 for and 1/100000 for  without  and ), making it comparable to a  drop.