Uncovering the Mysteries of the Horadric Strongrooms

In Diablo 4 Season 9, players will eventually come across a recurring quest called "The Truths That Lie Within." This mission becomes available immediately after completing "The Embers Yet Smolder" and marks your official introduction to one of the season's central mechanics: Horadric Strongrooms inside Nightmare Dungeons.

Whether you're grinding out reputation or just trying to progress the seasonal storyline, this guide will walk you through everything you need to know to complete The Truths That Lie Within efficiently-and maybe even unlock additional rewards along the way.

Quest Trigger: When Does It Start?

The quest "The Truths That Lie Within" will appear in your journal after finishing "The Embers Yet Smolder", which introduces the seasonal themes and Horadric mechanics. You don't need to be max level, but it's wise to have some combat-ready skills and defensive cooldowns active, especially for Nightmare content.

Quest Objectives

·Enter a Nightmare Dungeon

·Gain 150 Horadric Knowledge

(This comes from completing Horadric Strongrooms or slaying enemies inside the Nightmare Dungeon)

Preparation Tips

Before you step into your first Strongroom-equipped dungeon:

·Open your Inventory > Horadric Spells Tab

Equip whatever Horadric Spells you've unlocked. These spells synergize with your class and offer substantial advantages.

Examples include:

§Celestial Surge - Lightning-based AoE buffs

§Thunderous Particle - AoE crowd control/damage spells

§Use the Nightmare Sigil provided by the quest

This guaranteed Nightmare Dungeon has a Horadric Strongroom inside, so you don't need to find one on your own.

How to Complete The Truths That Lie Within

1. Enter the Supplied Nightmare Dungeon

Use the given Nightmare Sigil to activate the dungeon via your map. The location will be marked and includes a guaranteed Strongroom encounter.

2. Start Clearing the Dungeon Normally

Kill enemies as usual. Many mobs will drop Horadric Phials, which grant Horadric Knowledge-this is your progress bar for the quest.

3. Find the Horadric Strongroom

§The Strongroom is a locked room hidden somewhere within the dungeon.

§It contains elite enemies, a puzzle, and loot chests with Horadric-themed rewards.

§Interact with the door and defeat its challenges to access high-tier loot and extra knowledge.

4. Reach 150 Horadric Knowledge

§You'll likely hit this number before even completing the Strongroom, depending on enemy density.

§Once you reach 150 knowledge, the quest auto-completes. However, you can still finish the dungeon and loot the Strongroom for extra value.

5. Optional but Efficient:

§Activate the Strongroom even if the quest completes early-you'll still benefit from reputation, phials, and seasonal progression.

§If you're speedrunning quests, head back to Cerrigar to turn in and advance the next stage of the seasonal journey.

Key Advice: Double-Dipping Efficiency

The "Truths That Lie Within" quest will return multiple times throughout Season 9. That's because Horadric Knowledge is a renewable currency used for unlocking seasonal blessings and upgrading spells. So while the quest may feel like a one-time task, it acts as a repeating milestone for your progression.

Every Horadric Strongroom you complete:

·Contributes to seasonal reputation

·Grants crafting materials and spell components

·Helps you grind for rarer rewards later in the season

Rewards for Completing the Quest

While the quest itself doesn't offer a huge individual payout, it sets the stage for your Horadric Spell Power progression and unlocks future seasonal quests. Rewards include:

·Horadric Phials

·Spell Catalysts and Infusions

·Access to more Strongroom Keys and higher-tier dungeons

·Progress toward Season Blessings, like more Glyph XP or extra Diablo 4 Items drops

Final Notes

The Truths That Lie Within is less of a traditional side quest and more of a recurring objective that will constantly show up during your grind in Season 9. Treat it as your tracker for Horadric Strongroom progression, and always keep a few that you buy Diablo IV Items Nightmare Sigils with guaranteed Strongroom keys handy.