Telos, the Warden

Telos, the Warden is a solo-only boss that is intended for players with a high combat level. He is an elemental born from the Anima Mundi who guards and protects the Heart of Gielinor. He is billed as the toughest solo boss monster in RuneScape. His chamber is accessible through a large "tree" like structure in the middle of the dungeon. Players are able to attune a portal in the Max Guild to access Telos.

To fight Telos, players first must obtain an ancient sigil. The four 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 required to reach Telos. The components are always a guaranteed drop, but only appear to the person who dealt the most damage to the boss. Once used on the door in the middle of the dungeon, it will be consumed and give the player permanent access to the boss chamber.

Killing Telos is a possible Soul Reaper assignment. The assigned number of kills can vary between 2 and 8.

Telos is one of the bosses required to unlock the The Reaper title, which is a requirement for the untrimmed completionist cape. Defeating Telos at a minimum of 100% enrage or greater is a requirement for the trimmed completionist cape. Upon killing Telos at 500% or more enrage, players unlock the Warden title.

The music track Anima is unlocked by entering Telos's arena.

Strategies
While fighting Telos at under 100% enrage, the player will progress through four phases, each of which - upon successful completion of the phase - involve Telos and the player gradually descending down platforms into the Heart of Gielinor. If Telos is encountered at an enrage level of 100% or greater, the fight is extended to five phases, the last of which involves mechanics abstracted from all four phases preceding it.

Telos's difficulty is scalable: players are able to choose the fight's difficulty which affects both the difficulty of the boss and the value of rewards received from killing the boss. To do so, the player must successfully defeat Telos at an enrage level greater than 0% (see below). Then, when initiating a confrontation with Telos, the player will receive an interface in which they may select a custom enrage level (between 0% and the highest enrage level on which they successfully scored a kill plus 5%). Players can obtain all of Telos's unique drops at any enrage, but the chances of getting one increase with higher enrage.. As he gains enrage, his combat level, life points, and damage inflicted increase. The life points cap at 600,000 points at 200% enrage for the first four phases. Phase 5 caps at 200,000 life points at 300%, which gives Telos a maximum of 800,000 life points. The maximum possible enrage is 4000%.

There are global broadcasts for the first player to reach 100% enrage and every 100% increase in enrage after that. The first regular and hardcore ironman players to unlock the Warden title were also globally broadcast. At 0% enrage, the fight with Telos will be roughly the difficulty of fighting one of the Heart generals on challenge mode. At 100% enrage, the fight will be roughly the same as Araxxor.

Drops
Telos follows a special drop mechanic; upon obtaining loot, the player can either claim it or "chain" it (beginning a killstreak) by using the "continue challenge" option in order to increase their chances of getting better rewards in forthcoming encounters. Telos will always drop loot upon defeat. (see the tables below).

Upon defeating Telos, a large beam of anima will erupt from the hole into which he fell. Upon interacting with the beam, the player is presented with a reward within the Trove of Telos for their efforts. The player can "spin" the wheel for a reward, even though it is already pre-determined; a streamlined option is available to skip this feature. If the player leaves the area by accident, the inactive font in the "lobby" area of his chambers will activate and players can decide what to do from there.

Telos has three different "tiers" of rewards:

After defeating Telos and interacting with his trove, the player can either claim the current reward(s) or continue the challenge. Further kills cannot be attempted until the player claims the rewards in the trove or continues the challenge.

Claiming the current rewards in the trove will send them straight to the bank. This will end the player's killstreak and reset Telos' enrage back to 0%. This can be done any time by the player after defeating Telos (or vice versa). Soothsayer Sybil can reset Telos' enrage back to 0%, but it is not recommended to do so as you will forfeit all rewards held in the Trove.

Continuing the challenge will cause Telos to gain anywhere from 5-20% enrage, which is added onto the next battle with him. Subsequent challenges continue to stack new enrage to the current stack, capping at a total of 4000%. Players can battle Telos with their current supplies or return to the bank to replenish them. Logging out does not reset the killstreak. This process can be continued as long as the player wishes, though there is a cap to this. Up to 200 kills can be "stored" in the trove; if the player attempts to defeat Telos more than 200 times in a given killstreak, the game will prevent you from fighting Telos until you claim your rewards.

Important: If a player should die whilst on a killstreak at any level of enrage, they will retain a varied amount of their rewards and may reclaim them from the activated font on the initial platform. Part of the rewards will be removed as a penalty for dying. The percentage of rewards retained starts at 5% when starting a killstreak, increasing by 5% for every kill afterwards up to 75% (15 killstreak). The game calculates the rewards retained upon defeat to the nearest whole number, not by the value of the items held in the trove. For example, if the chest held 19 wine of saradomin with a 5% retain value, you would not receive anything because the result would yield a non-whole number of 0.95. If it held 20 wines instead at the same retain value, only one wine would be recovered. The rewards must be claimed if you are defeated during a killstreak, as the game will prevent you from fighting Telos again until you do so.

The player's luck also affects the Trove's contents. As it is considered "chest" loot, players do not have to bring luck items to each kill. This means that even if you begin a killstreak without the luck of the dwarves, you can bring it when you are ready to loot the Trove to see if there is any difference.

Unique
The drop rate of the unique items (excluding Telos' tendril) is dependent on Telos's enrage; the higher it is, the more likely a unique drop will be given. The bronze and silver drop tables have a significantly rarer drop rate for these items, while the gold drop table presumably follows the normal drop rate. Telos' tendril is not included in the rewards interface as it is received in a manner similar to the Araxyte pet and Volcanic shard.

Other
The type and quantity of the rewards is dependent on the player's killstreak and Telos' enrage level. Telos' enrage determines which reward is given, while the player's killstreak determines the quantity of that reward.

Trivia

 * On 11 August 2017, the player sadden became the first player to defeat Telos at 4000% enrage. Dialogue referring to this event was added to Soothsayer Sybil on 14 August 2017.
 * As Telos' combat level fluctuates based on his enrage, he would technically be the strongest monster in RuneScape when fought in an encounter of 801% or higher enrage, as it would give him a combat level of 10,010.
 * At 4000% enrage, Telos' combat level is 42,000.
 * 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, end, goal, or objective.
 * Upon release, there was a glitch/bug where with damage scrimshaws, it was possible for Telos to drop to 0 life points during the first three phases, "killing" him early. This would result in the player being unable to proceed further. This has since been hotfixed.
 * When successfully defeated by a player, the following message is displayed in the player's RuneMetrics event log: "I killed Telos, the final defender of the Heart of Gielinor." If the player defeats Telos more than once in a gameplay session, the message is changed to "I killed x  Telos, the final defenders of the Heart of Gielinor".
 * For a few days after release, players on a killstreak would lose all of their accumulated loot if they entered the arena and left without waking Telos. This has since been hotfixed.
 * Unlike other bosses that have a timer to record a player's personal fastest kill, the timer for Telos only appears at kills with 100% or more enrage.
 * The patch notes of 18 July 2016 changed the following:
 * Prior to the change, a player on a killstreak lost all of their rewards if they died or left while fighting Telos. This was changed because of how harsh this mechanic was, especially for players who disconnected during a fight. A change was implemented to allow players to retain some of the rewards if they die to Telos.
 * The player used to have to "spin" interfaces to determine their reward and enrage gained. Since it was already pre-determined, a streamlined option was added which will give the player their rewards and how much enrage Telos gains if they choose to continue the encounter.
 * On 26 September 2016, Telos received a combat update which allows him to perform rock fall attacks at any enrage level if he is unable to attack the player. However, players reported multiple bugs, which were fixed on 3 October 2016.
 * Telos would not attempt to melee the player on phase 2.
 * The orbs on phase 4 were already charged. In addition, when Telos is siphoning the fonts, the game would think that Telos is unable to attack the player and would send rocks crashing down on the player's position.
 * On 24 October 2016, Telos received an update for his enrage mechanic. The player can now fight Telos at their highest enrage + 5%. This is to help the player reach higher enrages, as the original method to obtain higher enrages was to defeat Telos with the enrage provided, and failing the kill in that enrage would force players to start over again. In addition, phase indicators were also added on his life points interface so players could know how much damage was needed before the next phase would start.


 * There is an occasional glitch where upon getting close to Telos, he will attempt to wake but suddenly turn dormant again. This can be fixed by moving away before running next to him.
 * Although the Behind the Scenes stated that Telos would use all three styles of combat, neither Telos or any of his minions use any type of ranged attack.
 * In the Beasts tab, when viewing Telos' "The End" attack, it shows him using it in his phase 1-4 form, rather than the phase 5 form.
 * His font drain attack also uses a different animation than the one used in the fight.