Nex

Nex is an immensely powerful entity, and one of Zaros' most powerful weapons of war. It is said that what she really is has been long lost to time. However, she possesses physical traits of the icyene, demons, aviantese and vampyres, being graceful, yet cruel and vicious. Thus, her race is indeterminable and her history and origin equally largely a mystery. It is known, though, that she is aligned to Zaros, being one of his most powerful weapons of war, and acts as something of a leader to his last army.

Nex resides behind the Frozen door in the God Wars Dungeon, in a previously inaccessible area which was released on 10 January 2011. She has over 15 unique combat moves, the most for any monster in the game. Her chamber is a multicombat area like the rest of the God Wars dungeon. She is cited as being RuneScape's most powerful and intelligent boss to date.

In order to fight Nex, you must access all of strongholds (but not boss room) of Armadyl, Bandos, Saradomin and Zamorak to retrieve a key part, effectively requiring 70 Agility, Constitution, Strength and Ranged (some boostable) to fight Nex. Together, the parts make a Frozen key with 5 charges to open the Frozen door. The key can be repaired for a cost of 50,000 coins per charge.

Unlike the other bosses of God Wars Dungeon, there is a bank to refill on supplies before fighting Nex.

It is confirmed to include the z-buffer and particle graphics engineering styles to create one of the best boss sprites to date. It is also confirmed to have sound effects built in, to create a voice during the fight. Jagex claims that Nex will be the most challenging and rewarding boss to date, "You're going to need help from your clan or some friends to take it down, but huge riches await those who succeed."

History
The Zarosian army was imprisoned by Saradomin's forces in the beginning of the Third Age in an attempt to rid Gielinor of Zaros's following. Nex managed to escape sometime during the God Wars when Saradomin, Armadyl, and Bandos were fighting the Zamorakian Army to protect the Godsword. It took the combined efforts of all 4 armies of the Gods to imprison Nex and its army behind the Frozen door in the Godwars Dungeon, however, because of all the adventurers who came to the God Wars Dungeon looking for the Godsword, Nex has once again awakened and is now trying to escape from its imprisonment and this time it is up to the adventurer to contain it once again.

The Four Mages
There are 4 mages on the each corner of Nex's chamber which each represent smoke, ice, shadow and blood spells. Nex draws power from them to use their spells as somewhat like an arena effect. You will be able to kill one of the mages when you take down a quarter of Nex's LP. She won't be able to use the mage's effect after you kill it respectively. Here are basic summaries of the mages' powers:

Blood: When she uses the blood mage's attribute, she will attack you with blood spells and drain your life points.

Shadow: This attack starts by the chamber getting darker. When it gets pitch-black, you will be hit for a lot of damage if you stand still and not move.

Ice: This attack prevents you from moving.

Smoke: She will occasionally send you smoke clouds, causing poisonous magic damage.

After all the mages are down, Nex will start using Soul Split prayer.

Attacks

 * "Let the virus flow through you" - 5 virus attacks that hit 170 each.
 * "NO ESCAPE!" - Nex will fly against you.
 * "NOW, THE POWER OF ZAROS!" - Special attack.
 * "Fear the shadow!" - Boss room becomes total darkness and if you're standing on the same place for ±1.5 seconds hits will deal 400-700 damage.

100% drop

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Herbs

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Other

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Trivia

 * "Nex" is Latin for "murder" or "death"; "torva" is Latin for "savage" or "fierce".
 * One of the twitter hints shows a plaque with the text: Vita brevis breviter in brevi finietur, Mors venit velociter quae neminem veretur, Omnia mors perimit et nulli miseretur, which is Latin for: "Life is short, it will end in a short time, Death comes quickly and respects no one, Death annihilates all and has pity on no one." This phrase is strongly connected to the phrase "memento mori", which means "remember your mortality."
 * The room layout is the symbol of Zaros.
 * If you look closely at the archway in the picture of the plaque mentioned above, you will see what seems to be the very top of the head of a green ghost. That is most probably the nature spirit Ashuelot Reis, serving as the banker in the area just before Nex's chamber.
 * Her combat level is 1001 and she was released on the 10th of January, which is written as 10/01 in most countries, such as England; in which Jagex is based in.
 * She is the first enemy to have a combat level over 1000.
 * With 30,000 lifepoints she takes over the lead of the monster with the highest life points. The previous was Corporeal Beast with 20,000.