Trollheim Wiki

Deep Beneath Trollheim OSRS: The Frozen Door Guide

November 14, 2026660 words4 min read

Discover the secrets deep beneath Trollheim in OSRS, including the Frozen Door miniquest, the Ancient Prison, and the mysterious 'Important letter'.

In Old School RuneScape (OSRS), the phrase "deep beneath Trollheim" refers to a hidden location within the God Wars Dungeon that houses the Ancient Prison. This area is central to The Frozen Door miniquest, which players begin after receiving a mysterious "Important letter." The dungeon serves as the prison for Nex, one of the most powerful generals of the deity Zaros, who is guarded by the four warring factions of the God Wars.

The Important Letter

The journey deep beneath Trollheim begins with the receipt of an Important letter. This item is delivered by a specific NPC known as the Messenger (The Frozen Door). The messenger is triggered to appear shortly after a player completes the Desert Treasure I quest.

Item Properties and Values

The letter is a members-only item and serves as the primary quest-starter for the Frozen Door miniquest.

PropertyDetail
Release Date16 December 2021
TradeableNo
EquipableNo
Value50 coins
AlchemyNot alchemisable
Item ID26366

Players should be aware that once the letter is read, it cannot be reobtained if it is destroyed. While it is not required to keep the letter to complete the miniquest, reading it is the essential first step in identifying the objective within the Trollheim dungeon.

The Frozen Door Miniquest

Upon reading the letter, players learn of an "ancient dungeon where four armies are locked in endless battle." The author of the letter, who identifies only as an "admirer," claims that a treasure of great appeal lies behind a frozen door within this dungeon.

However, the source material notes that this is an act of deception. The "admirer" is actually tricking the player into opening the Ancient Prison to release Nex. Evidence suggests the writer may be Sliske, who previously interacted with the player under the guise of Asgarnia Smith.

Objectives

To unlock the Frozen Door, players must seek out the leaders of the four armies currently occupying the God Wars Dungeon. Each leader holds a specific piece of a key required to grant access to the prison.

  1. Locate the Four Armies: Travel to the dungeon located deep beneath Trollheim.
  2. Defeat the Leaders: Obtain a key piece from each of the four faction leaders.
  3. Assemble the Frozen Key: Combine the pieces to create the Frozen key, which allows entry through the Frozen Door.

Key Pieces and Associated Enemies

The Frozen Key is composed of four distinct fragments, each held by one of the primary bosses within the God Wars Dungeon.

Key PieceAssociated Enemy LeaderFaction
Frozen key piece (Armadyl)Kree'arraArmadyl
Frozen key piece (Bandos)General GraardorBandos
Frozen key piece (Saradomin)Commander ZilyanaSaradomin
Frozen key piece (Zamorak)K'ril TsutsarothZamorak

Once all four pieces are collected and the Frozen Key is assembled, players can interact with the Frozen Door to progress the miniquest and encounter Ashuelot Reis, an NPC located within the Ancient Prison area.

Historical Changes and Lore

The text of the Important Letter has undergone revisions since its initial release. Prior to the launch of Desert Treasure II - The Fallen Empire, the letter’s opening paragraph stated, "We have sadly not yet had the pleasure of meeting."

On 26 July 2023, this was updated to reflect that the author and the player had indeed met. This change reinforces the theory that the "admirer" is Sliske, who met the player during previous encounters and played a role in the liberation of Azzanadra. The deception regarding the "treasure" behind the door is a central plot point, as the actual occupant is the dangerous Zarosian general, Nex.

Summary Checklist

  • Prerequisite: Complete Desert Treasure I.
  • Trigger: Wait for the Messenger to deliver the Important letter.
  • Action: Read the letter to start The Frozen Door miniquest.
  • Location: Head to the God Wars Dungeon deep beneath Trollheim.
  • Collection: Defeat Kree'arra, General Graardor, Commander Zilyana, and K'ril Tsutsaroth for their respective key pieces.
  • Outcome: Assemble the Frozen Key to unlock the Ancient Prison.