Skeletal Wyvern

Skeletal wyverns (Draconis Ossis) are very dangerous monsters which can drop Granite legs, and the rare Draconic visage. Level 72 Slayer is required to kill them. An Elemental shield or Mind shield must be equipped when fighting them.

Strengths and Weaknesses
The player must equip an Elemental shield, Dragonfire shield, or a Mind shield whilst fighting these or you will be hit for very significant damage (50+). The Wyverns attack with melee and a freezing-breath attack, they can freeze you rendering you unable to attack, though you can eat, teleport, etc. They have high Defence, high Attack and high Hitpoints making them very challenging opponents. They also require 72 Slayer to kill.

Their freezing-breath attack is not affected by any protection Prayers. Using protect from melee Prayer and Prayer potions is recommended as they hit fairly high and regularly. You will still take damage from the freezing-breath attack but much less than if you don't. However, the attack in which they jump up and glow is a ranged attack. Knowing this, you can safely range (remember, only use 1-handed range weapons because you need to have your Elemental, Dragonfire, or Mind shield in the other hand) them with the protect from Ranged prayer, only suffering damage from their ice breath.

Being undead makes them vulnerable to the effects of a Salve Amulet. The amulet also gives a +3 prayer bonus, so you can hit higher without a huge impact on your prayer drain rate.

Locations
Asgarnian Ice Caves

Drops
100% drop: Wyvern bones
 * 12 rune bolts
 * 30, 44, 132 or 220 Coins
 * 30 Air runes
 * 30 Water runes
 * 10 Chaos runes
 * 3 Law runes
 * 7 Blood runes
 * 10 or 11 Soul runes
 * 60 noted Pure essence
 * Black sword
 * Gem
 * Herb
 * Black axe
 * Dragon Dagger (P+)
 * Granite legs
 * Draconic visage (very rare)