Arceuus House

The Arceuus House (pronounced "Arr-KAY-us") in Great Kourend are wizards who commit themselves to studying magic through the Dark Altar, a mysterious altar whose powers extend to life and death, expanding their Magic abilities and producing runes for the region.

There is a fairy ring that can be reanimated by paying Trossa, located north of the Arceuus House Library, a one-time payment of 80,000 coins. The code, CIS, can only be used after Trossa reanimates the fairy ring.

A majority of those who reside in the Arceuus House are former humans who, through the power of the Dark Altar, are able to achieve immortality by moving their soul from their mortal body into an incorporeal one. Their souls are freed from the mortal bodies in the crypt below the church, and take on the incorporeal form commonly seen among Arceuus House residents.

The art of runecrafting has been known by the Arceuus House since 150 years before the wave of visitors from the mainland arrived. However, they were unable to create law runes, explaining the lack of teleportation spells around Zeah.

However, a book titled Transvergence Theory documents the differences between runecrafting in the mainland and runecrafting in Zeah. While the mainland uses talismans to teleport individuals to another dimension, runecrafters in Zeah use energy that emanates from the ground near the Dark Altar to change the essence.

The Arceuus House is closest to the northern reaches of Zeah, and is the first line of defence against the Wintertodt, a mysterious entity that brings along with it extremely harsh cold.

Transportation

There are several methods of travel:

Teleport to Kourend (Standard spellbook)
Fairy ring CIS (after 80,000 gp payment to Trossa)
Arceuus Home Teleport (from Arceuus spellbook) to Dark Altar
Xeric's talisman teleports to neighbouring areas and running to Arceuus House
Transport via ship to Piscarilius House or Land's End by talking to Veos in Port Sarim in the southernmost dock
Games necklace teleport to Wintertodt and then run south.
Skills necklace teleport to the Woodcutting Guild and then run north.

Gaining house favour

WARNING: If you already have 100% favour in another House, ensure you have spoken to the respective House's Architect to lock in the favour. To do this you must have started the Architectural Alliance miniquest by speaking to Hosa. Otherwise gaining favour in another House before speaking to them will make you lose favour in that house!

The Arceuus House's architect is Arcis, who is found east of the bank.

Earning the favour of the Arceuus can be done by assisting the Arceuus Elders with expanding their knowledge, seeking your own dark knowledge, mining Dense essence block and using the Arceuus spellbook. Once earning 100% favour of the Arceuus house, players are able to runecraft blood and soul runes at their respective altars if players have level 77 and 90 Runecrafting respectively.

Assisting library customers

Because of the Arceuus House Library's unhelpful librarian, Logosia, customers in the library are having trouble finding the texts they seek. Players can speak to Sam, Professor Gracklebone or Villia to search bookcases for books or scrolls around the library for them. To help narrow down where to search, talk to Biblia, the assistant librarian found at the top floor of the library. She wanders around the northern parts of the library.

Note that if a player is required to find either of the books Transportation Incantations or Soul journey, it is recommended to read them, as doing so will unlock the Teleport to Kourend spell and the Bear your Soul miniquest respectively.

Once the text is found and returned to the respective NPC, players are rewarded with a book of arcane knowledge and 2.5% favour. Speak to another NPC looking for assistance, as the NPC you already helped will be busy reading the book/scroll you gave them.

Seeking dark knowledge

Once players reach 20% favour, they can speak to Horphis, an Arceuus House wizard, who will ask players to collect dark manuscripts found within the library. Players can again speak to Biblia to narrow down the location of the dark manuscripts and the books.

Multiple manuscripts can be obtained without consistently returning to Horphis. Each manuscript given rewards a book of arcane knowledge and 5% favour.

Mining dense essence blocks

Once players reach 25% favour, they will be able to mine dense essence blocks within the dense runestone mine, located east of the Dark Altar. Make sure you bring a chisel as well as a pickaxe and have level 38 in crafting and mining.

Players can turn in dense essence blocks to Clerris, rewarding 0.1% favour for every block handed in.

General tips and additional information

As this involves a lot of running, players should wear lightweight gear (e.g. full Graceful) and bring a few Super energy or Stamina potions.
Most players spend most of their time earning favour at the library since it is the fastest method, which takes about two hours to gain 100% favour from zero.
Always speak to Biblia, who roams the corridor on the top floor, for help with finding books and manuscripts.
At 20% favour, it is strongly recommended to focus on manuscripts while doing book runs along the way only if they pose no inconvenience or entail going out of the way.
Stockpiling manuscripts saves time, but it helps to turn them in if going to past Horphis.
You can stockpile books and scrolls by returning to the location of the most recent request and grabbing another copy after handing the original in.
Even while remaining on the same world, the locations of books and manuscripts change after a while.
Sharing the locations of books and manuscripts with other players allows you to find them much more quickly. The best world to do this on is 310, the Kourend Group Activity world.
You can plant mithril seeds to mark the location of books and manuscripts that you find. This makes it easier to find the same shelf if you return to retrieve a second copy of a book; the flowers also serve as a clear marker of the location of books and manuscripts for other players.
If you plan to reanimate ensouled heads, it would be wisest to start reanimating at 60% favour. This is because reanimation also increases favour within the house and is a more efficient way of reaching 100% while simultaneously training prayer and magic.

House benefits

At 20% favour, players can access Thyria's Wares.
At 60% favour, players can speak to Tyss next to the Dark Altar to switch to the Arceuus spellbook, which contains reanimation spells that are intended for use on ensouled heads for Prayer training.
At 100%, players can make dark essence blocks, made by using dense essence blocks at the Dark Altar, which can be then used with a chisel to create dark essence fragments, used in runecrafting blood runes and soul runes, which also require 100% favour.
At 100% favour, players can create magic tablets to Arceuus spellbook teleports by using the lectern found in the Ouditor's house.
At 100% favour, players can speak to Tyss to obtain an Arceuus signet, which are required in building dark altars or occult altars within a player's Achievement Gallery.

Features

Arceuus Library

Main article: Arceuus House Library

The library is managed by the chief librarian, Logosia. The library can be used to help assist customers find books and/or scrolls in order to gain Arceuus favour.

Dense runestone mine

Main article: Dense runestone mine

The dense runestone mine is usable after gaining 25% Arceuus favour. Players are able to mine dense essence blocks, which are used in Runecrafting. Players require a pickaxe and a chisel in order to mine the rock.

Blood and Soul altars

Main articles: Blood altar and Soul altar

Players with 77 or 90 Runecrafting can craft blood runes and soul runes respectively after gaining 100% Arceuus favour.

Fairy ring

Main article: Fairy rings

CIS North of the Arceuus House Library Great Kourend. Players must pay a one-off fee 80,000 coins to Trossa in order to use it.

Dark altar

Main article: Dark altar

The dark altar is used to infest dense essence blocks to turn them into dark essence blocks, which are then crushed into dark essence fragments for use with the blood and soul altars. (requires 100% favour to make dark essence)

Regath's Wares

Main article: Regath's Wares

Regath sells various runes, vials of water and wizard hats. He is also one of the few non-player characters to sell soul runes, the other being Baba Yaga and from the Mage Training Arena rewards shop.

Tower of Magic

The Tower of Magic is currently inaccessible and players are forbidden to enter. A Tower Mage tells the player that "Lord Arceuus does not wish his experiments to be disturbed."