Dagannoth Kings

The Dagannoth Kings are a group of three dagannoths that live deep in the cave on Waterbirth Island. They are each level 303, and also represent the combat triangle. Each of them uses a different combat style, and are weak against the type that defeats them on the combat triangle, and immune to all others. Each King has a unique ring drop, except for Rex who has two. The rings give some of the best critical bonuses for their respective styles in the ring slot. All three kings have the ability to drop the dragon hatchet.
 * Dagannoth Supreme, the Dagannoth King that attacks with Ranged and is weak to Melee, specifically Stab and Balmung.
 * Dagannoth Rex, the Dagannoth King that attacks with Melee and is weak to Magic, specifically Fire Spells.
 * Dagannoth Prime, the Dagannoth King that attacks with Magic and is weak to Ranged, specifically Arrows.

In Blood Runs Deep
The Dagannoth Kings are also mentioned in the quest Blood Runs Deep, although they are never actually seen. They are responsible for the deaths of Prince Brand and Princess Astrid during the quest.

Getting there
The Dagannoth Kings reside in the sixth level of the Waterbirth Island Dungeon. Although the doors in the dungeon can now be opened by a single player, having a friend available to help kill the kings, or at least bless your grave if you die, may be helpful.

To get to the Dagannoth Kings, go to Rellekka (e.g., using the lodestone, enchanted lyre or house teleport) and then take the boat to Waterbirth Island. You will appear at the southwestern corner of the island and need to run counter-clockwise around the perimeter of the island until you reach a dungeon entrance. The lyre can also be reset to teleport to the dungeon entrance directly.

Once inside the dungeon, go through the doors at the far end and follow the path marked on the map.

Trivia

 * When the player used to kill Dagannoth Kings, it would read in your adventurers log which king you killed. Now, if a player kills a Dagannoth King (or more), it says "I killed a Dagannoth King," or if more are killed, "I killed # Dagannoth Kings."
 * Each of the three kings' names come from a Latin word. Supremus meaning 'highest', Prima meaning 'first' and Rex meaning 'King'.
 * Before the Evolution of Combat, the Kings had very high defence against attacks they were not weak to. After the update, the Kings gained complete immunity against the attacks they are not weak to. However, attacking familiars are able to bypass this immunity, even if the attacking familiar is using the wrong combat style.
 * For a short while after the Evolution of Combat, the Dagannoth Kings' aggression range was much further than their pre-EoC range. This was fixed in a hidden update.
 * On 4 February 2014, the respawn time of the Dagannoth Kings increased.

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