Telos, the Warden

Telos, the Warden is a solo boss that is intended for high combat level players. Telos is a knight born from the Anima Mundi who guards and protects the Heart of Gielinor. The boss is accessed by entering a tree in the centre of the Heart of Gielinor. Players are able to attune a portal in the Max Guild to access Telos. To fight Telos, players must obtain an ancient sigil. The components of the sigil can be obtained by killing all the generals in the Heart at least once; therefore, there is a minimum of 80 Attack, Prayer, Magic and Ranged to reach Telos. The components are always a 100% drop, but the player must either solo, or if killing them in a group, deal the most damage to obtain the component. Once used, the player will have free access to the boss chamber without having to kill the generals again. Killing Telos is a Soul Reaper assignment (in batches of 2-4) and is a completionist cape requirement.

While fighting Telos the player will progress through four stages which involve the boss and the player descending down levels into the Heart of Gielinor. Telos' difficulty will be scalable: players will be able to chose the fight's difficulty which will affect the value of rewards received from killing the boss. It will be possible to receive all the boss' drops at its lowest difficulty, but chance of receiving drops will increase with the boss' difficulty.

The boss will also have an enrage mechanic, similar to Araxxor, where subsequent fights become more difficult when the player has successfully killed the boss. Once players have reached a checkpoint of no longer being able to defeat Telos then they will be able to choose the enrage level at which they start fighting the boss. Telos' max enrage caps out at 4000%. There will be broadcasts for the first player to reach 100% enrage and every 100% increase in enrage after that. Players should be able to defeat Telos initially using the tier 85 Anima Core armour, as it will begin with a difficulty comparable to that of a challenge mode fight with a Heart general.

Drops
Telos follows a special drop mechanic; upon obtaining loot, the player can either claim it or "chain" it to increase their chances of getting better rewards. However, if the player does not succeed in killing Telos, either by dying, logging out or teleporting out of the fight, then they will lose all of the rewards that they have earned so far.

Telos will drop components of three tier 92 weapons—Staff of Sliske, Seren godbow, Zaros godsword. The completed weapons will be tradeable. The components required for each weapon will include untradeable components and a specific tradeable component for each type of weapon. The weapons will be degradeable but repairable. The weapons will be augmentable on release.

Telos will also drop a codex for a new ability called Reprisal.

Like most other bosses, Telos will also have a pet drop, Tess.

Trivia

 * A new solo boss monster was first mentioned at RuneFest 2015. Concept art from Runefest showed a boss fight taking place underwater, however the underwater concept was later changed to the fight taking place in the Heart of Gielinor.
 * is the Greek word for purpose, aim, goal, or objective.