Skeletal horror

The Skeletal Horror is a monster you can kill once the wishlist for the quest Fur 'n' Seek is complete, once a week. While fighting it, both hands and the tail will come off. Pick them up and bury these to make its level go down. After the parts are buried you can kill it and talk to the Odd Old Man for your reward. The first fight will reward you with 10,000 Slayer experience and 7,000 Prayer experience. To fight the Skeletal Horror again you must first talk to the Odd Old Man and ask him to rebuild the creature for you (he will then rebuild the creature every week for you to fight it). Every subsequent fight after will reward you with 1,250 Slayer experience and 1,000 Prayer experience.

Habitat
East of the Odd Old Man once the wish list for the second part of Fur 'n' Seek is complete.

Strategy
The Skeletal Horror can be very dangerous for anyone not prepared. Wear high melee defence armour such as Barrows or Dragon and pray "Protect from Magic" as the magic attack appears to be faster than his melee and much more accurate. Unfortunately, the Skeletal Horror will not attack you with the attack-type that you are praying from, so high healing food such as sharks or rocktails is recommended. After you have cut both of its arms off, it seems to lose its magic attack. You can safely switch to Protect from Melee at this point.

Use a basic weapon set up of a Dragon Dagger (p++) and an Abyssal Whip or other strong melee weapon as well as a super set of potions. Use all four Dragon Dagger specials and then switch to your other weapon to finish him off. If a player has 80+ in attack, strength, and defence he or she should not have much trouble.

Basically, if you can kill a mithril dragon for the second bone wish-list, you are well prepared to fight this monster.

An excellent way to kill this monster is to use Range, as it is very weak to ranged attacks. Start with Ruby Bolts(e) and switch to Diamond bolts(e) when it becomes its lowest level. Optionally, use Runite bolts (p+) to poison it, and then switch to the other bolts.

You can use a Familiar in the fight as well.

If you die fighting the Skeletal Horror, your tombstone will appear outside the entrance to the stairs leading to the battle, so you can get your lost items back safely if you can make it back in time.

NOTE: At times during the fight the Skeletal Horror's limbs and tail will fall off and be thrown to the other side of the battlefield. First the right hand will fall off, then the left hand, and finally his tail. Take the time to pick up these pieces and bury them, as letting them return to its master will heal him considerably. When you bury the pieces, the Skeletal Horror will be weakened, which will lower its max hit, accuracy, and combat level. The combat levels are as follows: 320, 260, 180, and lastly, 100.

Trivia

 * The skeletal horror can not use its magic attack any more after its arms are cut off.
 * In the old diary, it is suggested that the Skeletal horror's skull was the model for the black mask.
 * The Skeletal Horror is supposed to be an ancient beast yet most of its bones are from other creatures. Some, such as the skull, are presumably the original bones of the ancient beast that the Odd Old Man found.
 * The Skeletal horror has one of the 'non-chafing manacles' that was on the Odd Old Man's wishlist after completing the Rag and Bone Man quest and the first wishlist. It appears that the Golden Fleece is what makes it non-chafing.
 * All the bones retrieved from Rag and Bone Man, Rag and Bone Man wishlist and the Fur 'n' Seek wishlist can be all found on the Skeletal horror.
 * Jagex has stated that the Skeletal Horror will be one of the creatures to drop the new Elite Treasure Trail scrolls once the update is released.