Early in your adventure in Diablo 4, you may acquire a mysterious Rusted Key from a slain cultist. But what purpose could this dilapidated item serve? In this guide, I'll reveal how to maximize the rewards from using your Rusted Key through a secret dungeon crawl.

Locating the Rusted Door

The first step is finding where this Rusted Key unlocks something. During your adventures around New Tristram, be on the lookout for a partially collapsed stone building with an out-of-place iron-bound door. Interacting with it yields a clue - this massive portal requires a key to open.

The door is usually located on the outskirts of town tucked away behind some foliage or rubble. Thoroughly exploring side paths and dead ends will reveal its location. Make note of where it is for returning later once key is acquired.

Preparing for the Dungeon

Venturing into the unknown holds unknown dangers. Boost your character's power before braving what lies within. Grind bounties and challenges for experience levels. Acquire new Diablo 4 items and stack your inventory with potions.

You'll also want a hefty pile of Diablo IV gold to afford repairs between attempts. Completing lucrative side quests and selling extra gear awards funds for precarious delving. With preparations complete, it's time to unlock what the Rusted Key obscures...

Entering the Rusted Depths

Interact with the immense iron door while holding the Rusted Key (Learn how to use the Rusted Key in Diablo 4). With a heavy groan, it splits open, revealing a darkness that entices and threatens equally. Step within to find winding stone steps descending endlessly into black.

The Rusted Depths lie in wait below. Torches in sconces afford the only light source down twisting passages. Cultists and worse likely lurk the shadowy halls ahead. Proceed with caution into the depths to face mystery and chance historic rewards.

Exploring the Depths

Wander the labyrinthine corridors battling teeming foes. Clear rooms methodically, checking every nook for chests holding enticing loot. Smash breakables too, as they may contain hidden troves of Diablo IV gold and potions.

Defeating minibosses guarantees epic-tier rewards. Seek them out while exploring. Maps drop occasionally too, showing undiscovered sections to maximize your delving. With care and thorough searching, all the Depths' rewards can be claimed as your own.

Facing the Overseer

Deepest in the darkness lies the culmination of your exploration - a towering abomination called the Overseer. A harrowing battle against this behemoth awaits any brave enough to challenge it.

Take the beast down to reap epic treasures as loot. But its death also opens long-sealed passages revealing greater mysteries within the Depths. New opportunities for experience, crafting recipes, and piles of Diablo 4 gold emerge with every discovered nook.

Making the Most of Rewards

With the darkness driven back, it's time to fully capitalize on the Rusted Depths' rewards. Epic loot from the Overseer and chests throughout holds great power and value. Hold onto best pieces for yourself or sell others.

Common crafting materials also have practical uses. But rarest recipes unlock access to optimal D4 items. Gold rewards immediate strength increases. Overall, delving the depths immensely powers up any adventurer's fortunes!

Optional Further Exploration

Brave enough still to challenge further mysteries? Return to the Depths whenever feeling bold. New randomized sections emerge with each visit, harboring fresh opportunities. Each subsequent delve provides another chance to increase your strengths via treasures within.

No stone goes unturned with focused, meticulous searching. Scarce pots and tables could hide bundles of Diablo IV gold and materials. Persistent pilfering pays off working every dark crevice of the Depths dry of plunder.

The Rusted Depths offer one of the most rewarding early game secret challenges in Diablo 4. Through intense dungeon crawling battling endless legions, epic crafting schematics, gold, and powerful Diablo 4 items await those patient enough to fully excavate its gloomy corridors.

With careful preparation and meticulous exploring, dedicated spelunkers can reap boundless gains repeatedly returning to challenge further mysteries. Now get exploring - your rewards are waiting below!