Dragonfantom

The Dragonfantom is Runescape's highest leveled monster, at level 20,005 he must be fought by atleast 700 people to be properly killed. However many people call it a worth it opportunity for as he drops the Deathsword, which is the best Runescape weapon created.

Strategy
The proper way to kill this monster is with minimum 700 players, which will be divided into healers, magers, rangers and warriors.

The rangers must have ruby bolts (e) and must be atleast 200.

The mages must have Ice clevenge (103 magic) which will freeze it for a minute, must be atleast 100.

The healers must have familiars, such as Transportalhoms to carry food and potions and must be at least 300.

The warriors must use a Dragonflint Whip, dropped by flint warriors in the lower dungeons, to weaken each head and stop the dragonfire, at least 100.

Story
This boss was created by N'gLugCjok, a necromancer who wanted to kill the King Black Dragon alone. He used zombies to attack it and the zombies gone crazy, and eventually were devoured, the King Black Dragon ate them all, and they were over a thousand. He kept growing levels until a green dragon zombie was arisen and somehow the zombie won and the necromancer was so happy he decided to arisen the King Black Dragon as his own, however something wrong happened and the green zombie was mixed in, causing this monster to form.

Zamorak was believed to have sent N'gLugCjok to create eternal darkness over the world, while Saradomin was believed to have teleported the monster to a new lair, out of Gielinor which made it hard to reach.

Armadyl eventually found it and attacked it with an Armadyl Godsword, failing to do so the monster devoured the godsword and the Deathsword formed, also teleporting itself to the God Wars Dungeon, it's army is the zombies.

This monster is believed to be afraid of Bandos because he was the first to ever steal the Deathsword.

However the dragon resurrects every five minutes because the necromancer is hiding under a rock within the cave.