|Release date||5 January 2017 (Update)|
|Immune to poison?||Yes|
|Attack style||Melee, Ranged (small)
Melee, Magic, Ranged (large)'
|Always drops||Big bones, Houndmaster's diary|
|A mutated guardian of Xeric.|
The Muttadiles are bosses encountered in the Chambers of Xeric. It is a dog-like creature that has horribly mutated into a giant crocodilian beast. The original muttadile was pregnant at the time when Xeric transformed it into its current form and as such its offspring was warped too. The two beasts now act as guardians of the chambers.
The two Muttadiles that reside in the chamber are present upon entering; a small one is on the ground and the large one is lurking in the water.
The small muttadile only attacks with both Melee and Ranged. While this smaller muttadile is alive, the larger one will stay submerged in the water, where it is unattackable and attacks players with Magic (which covers the whole chamber). Protect from Missiles and Ranged gear are recommended for the small muttadile.
When the smaller muttadile dies, the larger one emerges from the water and starts attacking the player. Apart from having higher stats and using all three forms of combat, this larger muttadile will also perform a shockwave attack if anyone is within melee range, dealing massive damage to them. It is important to stay away from melee distance of the larger muttadile and utilise safespots, which are found near the entrance in a corner, a bit north of the meat tree, or in the corner close to where the muttadile emerged from the water, to ensure the muttadile will only use Magic and Ranged on the team. When fighting the large muttadile, Protect from Magic is recommended.
As the muttadiles' health lowers, they will go to the nearby meat tree and start eating it to replenish health. Players can use Ice Barrage or Zamorak Godsword's special attack to stop them from going to the tree. Alternatively, players can cut down the meat tree. Another method is to simply let the muttadile replenish its health, as it stops trying to eat the tree after it has done so several times. Using this method yields higher points, but more damage taken.
Item Quantity Rarity GE market price Big bones 1 Always 191 Houndmaster's diary 1 Always Not sold Overload (+) 1 Always Not sold Prayer enhance (+) 1 Always Not sold Xeric's aid (+) 1 Always  Not sold Revitalisation (+) 1 Always  Not sold
Item Quantity Rarity GE market price Long bone 1 Rare (1/400) Not sold Curved bone 1 Very rare (1/5,000) Not sold
- The word 'Muttadile' is a portmanteau of mutt, mutant and crocodile.
- The strange bells near the entrance have the examine text "for whom?" which could be a reference to the 1940 novel For whom the bell tolls by Ernest Hemingway.