Wyvern

Wyverns are draconic monsters in the Asgarnian Ice Dungeon. They were first revealed at RuneFest 2015, after being pitched on RuneLabs and being one of the November poll winners. They require level 96 Slayer to be killed. Wyverns reside in an icy cavern beneath the area the skeletal wyverns reside in.

Location
Go to the Asgarnian Ice Dungeon, enter the skeletal wyverns' cave, and go to the south-west corner. There will be rope in a hole in the floor, descend down the rope and that is where the living wyverns are.

The quickest methods of reaching the cave are by using the Port Sarim lodestone, using fairy ring code to Mudskipper Point, or teleporting to the Asgarnian Ice Dungeon resource dungeon with a Hoardstalker ring.

Mechanics
Upon entry, the chill of the cavern will start to take effect, and an icy overlay will appear atop the screen that becomes more visible as the player gets colder. The chill of the cavern will apply 3 separate effects to a player as they lose heat.

Players can mitigate the chill effect by lighting any of the 3 unlit fires scattered throughout the cave. While a fire is lit, standing next to it will cause a player to slowly warm up. Thus, fighting wyverns from afar while standing next to a lit fire will allow a player to avoid dealing with the worst of the chill effects. Lit fires will only last a short time before they burn out and must be lit again.
 * Warm: Wyvern poison damage increased up to 900 per 4-5 ticks.
 * Cold: Wyvern attack damage greatly increased; damage around 2,500 becomes typical.
 * Coldest: Player will be constantly stunned at 8–10 seconds per stun; it is highly advised to get out of the cavern if this happens.

The chill effects can be reset by leaving the cavern.

The wyverns have various ice breaths, their normal ones (used by their skeletal brethren), and a poisonous one. Whenever the wyvern uses the poisonous ice breath, a message will appear and say "A strong wyvern poison corrodes into your bones." The poisonous dragonfire's magic damage can be negated with Wyrmfire potions, but does not affect their poison damage. Unlike other poison sources, it cannot be cured from antipoison potions, the Anti-poison totem and the Poison Purge aura. However, Antipoison++ will reduce the poison's damage by half if used, but like all monsters capable of poisoning, it will not last the full 12 minutes.

Like most other monsters capable of using multiple combat styles, when attacked from a distance, wyverns will use magic and ranged attacks. When within melee range of their target, they will use melee and magic instead. With quick reflexes, a player can swap their prayers to halve incoming damage; however their attack animation and damage calculation is faster than other monsters and it may be better to use one protect/deflect prayer while using shield abilities to deal with the other one. Using Protect/Deflect Melee while killing them within melee distance is also a viable option, as they will only use their melee and normal/poison wyrmfire attacks that way. One has to be more wary of the cold this way, though, as it involves constantly moving away from the fires.

Trivia

 * Wyverns are referred to as living wyverns in the beast tab kill count interface.
 * There was a glitch where if assigned wyverns, when quickchatted it would say you are assigned "Nothing", including if they are preferred or blocked. This did not affect the built-in slayer counter however, and has since been fixed.
 * If multiple players attack a single wyvern, no loot will drop for either player.