Are you ready to infiltrate a cult, navigate ancient ruins, and tackle a powerful boss? This guide will help you through every step of the Heart of Darkness quest in Old School RuneScape (OSRS), covering everything from setup to the final battle.

If you're not up for completing the quest yourself, consider using our OSRS Quest Services to have it done for you by experienced players!

Before You Start

To begin the Heart of Darkness quest, you'll need the following skills:

55 Mining (unboosted)

48 Thieving (unboosted)

48 Slayer (unboosted)

46 Agility (unboosted)

Additionally, you must have completed the Twilight's Promise and Children of the Sun quests. For help with these, check out our guides.

Gearing Up & Items Needed

Though lower stats may get you through, aiming for 70+ in combat stats and 43 Prayer (for protection prayers) is recommended. Here's a rundown of items to bring:

30 coins (for room rental)

Best melee gear

High-healing food (like sharks)

Prayer potions (about 3)

Super combat potion

Emergency teleport

To save time later, also bring:

10 Quetzal feed

3 limestone bricks

4 soft clay

These items will let you build a landing site at Salvager Overlook, creating a helpful fast-travel point.

Quick Guide

If you’re only interested in completing the quest quickly, here’s a summary:

Infiltrating the Cult:

Speak with Prince Itzla at Teomat, then travel to Quetzacalli Gorge.

Pay 30 coins at the Windbreaker pub for a room.

Meet Prince Itzla in disguise, and speak to the general store shopkeeper.

The Four Trials:

Trial 1: Solve the password puzzle by collecting clues.

Trial 2: Survive waves of enemies while protecting Prince Itzla.

Trial 3: Investigate and identify the traitor among the cult members.

Trial 4: Duel Prince Itzla using combat skills and defensive tactics.

The Ruins of Tapoyauik:

Equip Emissary robes, then enter the Twilight Temple.

Navigate through traps, and solve the icon puzzle.

Defeat Amoxliatl, the final boss, by avoiding its ice-based attacks.

Detailed Walkthrough

Part 1: Infiltrating the Cult

Start the quest by talking to Prince Itzla at Teomat, who enlists you to infiltrate a cult. Head to Quetzacalli Gorge, find the Windbreaker pub, and pay 30 coins for a room. After a short rest, you’ll meet Prince Itzla in disguise, who explains the mission details. He directs you to the general store for help infiltrating the Twilight Temple.

Part 2: The Four Trials

Trial 1: Password Puzzle

Enter the tower and pickpocket an Emissary Ascended for a key. Use it to access a chest with a book and a paper scrap. Solve the password by reading the white letters in the book and opening several chests based on directions decoded from the poem inside.

Trial 2: Combat Challenge

Equip your best melee gear and activate Protect from Melee. You’ll face waves of enemies, including Emissary Brawlers (melee attackers) and Emissary Conjurers (magic users). Protect Prince Itzla by healing him with bandages from nearby medical boxes.

Trial 3: Traitor Investigation

Talk to four cult members to find the traitor. Loyal members talk about the "new world after the end," while the traitor will mention "eternal life in Mictl." Accuse the traitor based on inconsistencies.

Trial 4: Duel with Prince Itzla

Prepare for a challenging fight. Prince Itzla uses powerful melee attacks, with special moves that disable prayers and deal AoE damage. Watch the chat box for warnings and reactivate Protect from Melee as necessary.

Part 3: The Ruins of Tapoyauik

Equip Emissary robes and head to Twilight Temple. Prepare to navigate traps and frost creatures. Pull levers, dodge ice traps, and solve the icon puzzle by matching elements with the correct statues.

Final Boss: Amoxliatl, Guardian of Tapoyauik

Equip high-healing food, prayer potions, and melee gear to take down Amoxliatl. The boss uses both magic and ice attacks:

1.Avoid Ice Pools: Move quickly to avoid damage from ice pools.

2.Destroy Ice Blocks: Amoxliatl summons ice blocks that must be broken before they form healing pools.

3.React Quickly: Watch for prayer-disabling attacks and re-enable Protect from Magic when necessary.

After defeating the boss, you’ll be teleported back to complete the quest by speaking with Servius.

Conclusion

Congratulations! Completing the Heart of Darkness quest rewards you with experience in Mining, Thieving, Slayer, and Agility, along with access to new fast-travel options. Enjoy your achievements, and if you’re ever up for more adventures, RSgoldfast is ready to help!