Sign In Daily & Earn Points And Get Significant Discounts! Sign In Daily & Earn Points And Get Significant Discounts! Sign In Daily & Earn Points!

Choose your country and currency

Country / Region:

United States

Currency:

USD

USD

EUR

GBP

CAD

AUD

Shopping Cart
Total items

Subtotal:

Discount: -

Continue shopping

Your cart is empty !

Continue shopping
Surplus Stock:

Categories

POE Currency POE 2 Currency Diablo 4 Items WOW Classic ARC Raiders Last Epoch Diablo 2 Resurrected Dark and Darker Help Center Sell To Us Affiliate Member Discount About Us News Guide AUP Policy Terms & Conditions Privacy Policy Refund Policy AML Policy

Send60s

I want to get information about activities, sales and personal offers

Diablo 4 Season 15 Mythic Farming Guide: Belial, Mephisto & Undercity Routes

Sep 22, 2026 Author: POECurrency.com

Players, there have been significant changes to how Mythics are obtained in Diablo 4 Season 15; some older farming routes have returned, alongside the introduction of some new keys, tickets, and crafting mechanics.

To farm Mythics efficiently this season, there are new strategies worth trying; choosing the right approach will give you a major efficiency advantage over others.

Basic Strategy

Mythics can drop from almost all Season 15 activities, including Helltides, Nightmare Dungeons, Whisper Caches, and various events, though the drop rates are generally low.

However, there is also a chance to get Mythics when encountering events involving Diablo, Baal, or Mephisto during Helltides.

Traditional boss farming methods remain viable, though you will need to structure your rotation around Lair Keys.

Diablo 4 Season 15 Mythic Farming Guide: Belial, Mephisto & Undercity Routes

Lair Keys

Standard Lair Keys are primarily obtained through War Plans, Helltides, World Bosses, Tree of Whispers, and The Undercity. Defeating a boss with a lower-tier key offers a chance - though not a guarantee - to drop a Greater Lair Key.

Continuing to use these keys creates a chance to spawn Baby Belial, which can drop one or even multiple Superior Lair Keys.

Superior Lair Keys in Diablo 4 Season 15 are mainly used to challenge Belial. If you prefer to skip Infernal Hordes or Escalating Nightmare Dungeons, you can save your Superior Lair Keys for Belial and choose Astaroth or Bartuc chests there.

While all Lair bosses can drop Mythics, Belial boasts the highest drop rate, making him a prime target for focused farming.

Mephisto

Mephisto's encounter is arguably one of the toughest boss fights this season, but the rewards have been significantly buffed.

Using Crux of False Prophet to challenge him guarantees a Mythic drop. However, this key is rare; primary sources include Initiate Bosses in War Plans, World Bosses, standard elite monsters, and Superior Lair Bosses at Torment 10 difficulty or higher.

The loot pool includes all Diablo 4 Season 15 Mythics, though the specific item is random - you cannot choose a specific gear slot.

If your character is powerful enough, or if you can find a reliable team, challenging Mephisto becomes a highly efficient way to farm Mythics. 

The Undercity

The Undercity retains the buffs it received previously in Season 15.

Using Horadric Cube, you can transmute five Greater Tributes of Armaments into one Mythic Tribute of Armaments. This guarantees a Mythic drop, with a higher likelihood of it being an Iconic Mythic.

While navigating The Undercity, choosing the path associated with War Plans on the left can spawn a Portal Prankster. Defeating it and clearing the nearby Beacon offers a chance for an extra treasure chest to appear, which can drop a Mythic, though it is not guaranteed.

If you prefer a boss-focused route, you can select Lair of Plenty option to increase monster difficulty; note that this still requires the corresponding key.

The central path offers a chance to unlock Ultimate Nemesis Lair, which requires three Superior Lair Keys. Even if Lair doesn't spawn, carrying a Splinter of Destruction increases the spawn rate of various portals.

Buy Diablo 4 items at POECURRENCY.com to make your build more powerful

Blacksmith

In Diablo 4 Season 15, Blacksmith now offers two types of random crafting: Random Mythic Unique and Random Iconic Mythic Unique.

Iconic Mythic Unique pool includes powerful Diablo 4 items such as Ring of Starless Skies, Melted Heart of Selig, and The Grandfather.

Consequently, Blacksmith is a worthwhile option to include in your Mythic farming strategy.

Jeweler

Jeweler's Rune Crafting feature allows you to use Runes and Resplendent Sparks to randomly craft items from the entire Mythic pool.

If you have a specific goal - such as targeting only two-handed weapons - Jeweler's pool is more focused than Blacksmith's fully random option, making it ideal when you need a specific gear slot filled.

Furthermore, gear crafted by either Blacksmith or Jeweler does not carry Crafted tag, meaning you can equip multiple items crafted this way simultaneously.

Horadric Cube Upgrades

Diablo 4 Horadric Cube allows you to upgrade a standard Unique item into a Mythic item on a one-to-one basis, while retaining all original stats.

Take Gohr's Devastating Grips, for example: the original Strength, Critical Strike Damage, Whirlwind ranks, and any added Vulnerable stats are all preserved.

Upgraded items bear Crafted tag; therefore, you can only equip one Crafted Mythic item created via Horadric Cube at a time. If you lack sufficient Resplendent Sparks, the upgrade option will appear in red and be unclickable; you can only proceed with the upgrade once you have enough Sparks.

Horadric Cube upgrades in Diablo 4 Season 15

Additionally, since you can only equip one Crafted Mythic item from Horadric Cube, you must choose carefully.

Some builds utilize Resplendent Sparks to upgrade key items like Infinity for a significant damage boost; before upgrading, ensure the item slot doesn't conflict with your existing core gear.

For content requiring rare keys to open chests or involving high-difficulty monsters, farming in a group is more reliable than solo play and brings you closer to obtaining a Mythic item.

In short, there are plenty of ways to acquire Mythics in Diablo 4 Season 15: prioritize using Superior Lair Keys on Belial, and challenge Mephisto whenever you have a Crux of False Prophet.

For your daily routine, general world drops and boss farming are sufficient.

Recommended Article

View More
Diablo 4 Season 14's Seasonal Mechanics Just Changed Everything: Massive New Endgame System, Boss Loop & Loot Overhaul Explained
Diablo 4 Season 14's Seasonal Mechanics Just Changed Everything: Massive New Endgame System, Boss Loop & Loot Overhaul Explained

Diablo 4 Season 14: Season of Death Awakening is less than a week away from its official launch, and players are most concerned about the core gameplay mechanics of the new season.

Compared to previous seasons, Season 14 introduces new open-world events, a new reward system, new Lair Bosses, a new equipment system, and a new endgame dungeon. The changes and adjustments brought by the new season are a complete overhaul.

A thorough understanding of the basic gameplay mechanics before the new season launches will help you survive and progress in the game. Below is a detailed introduction to this new season mechanic.

Core Event - Pandemonium Ruptures

Pandemonium Ruptures are the core event of Diablo 4 Season of Death Awakening, essentially a dynamic combat system connecting several core elements. It randomly generates several Ruptures in open areas such as Helltide and dungeons on the map, but certain trigger conditions must be met for them to spawn.

Triggering Conditions

Players need to find Death's Head Idol on the world map and kill Guardians surrounding it to successfully activate Rupture Zone. Ruptures will spawn in this area, and new seasonal monster families will emerge from them.

Successfully killing them will reward players with loot, the most important of which is Pandemonium Fragments, the newest equipment upgrade material in Diablo 4 Season 14.

While, based on Blizzard's usual practices, the drop rate of Pandemonium Fragments is unlikely to be high, Pandemonium Ruptures are indeed the primary source of them.

Core Mechanics

Loot Logic is the most unique and core mechanism of Pandemonium Ruptures, determining your rewards within them. Generally, a player's rewards while farming depend on monster density and rarity, but within Ruptures, your rewards increase linearly with the duration of Rupture.

One crucial point to understand is that the duration of Ruptures isn't fixed. The faster you defeat them, the more stable and faster they respawn; the longer you fight them, the higher the chance of reward stacking.

Therefore, Rupture rewards ultimately come from: base monster drops + Rupture completion rewards + Tears collection rewards + time-based sustain rewards.

Besides defeating monsters, increasing the duration of Ruptures also involves fighting within the circle and clearing Tears. If you're not careful with your positioning and go outside the circle, or die midway, Rupture's duration will be shortened.

Types

Randomly generated Pandemonium Ruptures primarily come in three types:

1. Normal Rupture

This will be the most common type of Rupture in Diablo 4 season 14. It's low-risk, the monsters aren't very strong, and players can easily handle it in the early game. However, the loot rewards are only basic and of low quality. But it's sufficient for resource accumulation and rapid leveling during the early game.

2. Surging Rupture

Surging Ruptures typically appear in Helltide or during world event transitions, summoning stronger monsters. Correspondingly, the rewards for clearing the area also increase, making it a primary way to upgrade equipment in the mid-game.

It's important to note that completing a Surging Rupture requires not only safely defeating all monsters but also achieving a Mastery rating. This means simply clearing the stage isn't enough; you need to demonstrate excellent damage output and strategy, rather than blindly using skills or maintaining invincibility.

Therefore, players should ensure their equipment level is sufficient to handle higher-level Ruptures before entering one. This will make achieving a Mastery rating in a Surging Rupture much easier.

Additionally, Hunt Realmwalker 2.0, a new seasonal mechanic in Diablo 4's Season of Death Awakening, has a chance to summon a Realmwalker after achieving Mastery.

3. Colossal Rupture

This Rupture only appears in Fields of Desecration, located in the south of Zarbinzet. The monsters are extremely strong, dense, and the loot is of top quality, but the risk is also extremely high.

Especially since the official announcement confirms that new Ruptures will spawn faster, you should ensure your level and equipment are fully optimized before entering this area to withstand the high-intensity monster attacks.

Completing a Colossal Rupture guarantees the spawn of a Realmwalker. Some players might wonder, while killing monsters in Ruptures yields materials, Diablo 4 Items, and Gold, what rewards are given for defeating Realmwalker, given its unique spawn conditions?

New Endgame Raid - Deathtoll Chamber

Deathtoll Chamber is a new mini-dungeon in Diablo 4 Season 14. Unlike previous dungeons, it's smaller and is a single-player dungeon. Defeating Realmwalker is the key to opening Deathtoll Chamber portal.

In Deathtoll Chamber, you'll encounter the new season's unique New Risen monster family - Gravehounds - and their leader, Exarch.

Each Gravehound drops an Orb upon defeat. Exarch absorbs Orbs' energy to strengthen itself. To prevent it from becoming too powerful and preventing you from clearing the chamber, you must intercept Orbs before it absorbs energy.

After successfully defeating all Gravehounds and Exarch, you'll receive Superior Lair Keys, the keys to unlock the season's new endgame Lair Boss reward.

New Lair Boss - Corrupted Reaper

Another core element of Diablo 4 Season of Death Awakening's seasonal mechanics is Corrupted Reaper, located in Pandemonium Threshold in Zarbinzet. You'll consistently receive a Superior Lair Key to open its reward chest after successfully clearing Deathtoll Chamber.

Generally, by this time, the season is in its mid-to-late stages, and most players' levels and equipment are nearing maximum. Only challenge Corrupted Reaper when you're certain you can safely complete the game. Once you successfully defeat it once, you can challenge it repeatedly.

The reward for defeating Corrupted Reaper is a reward chest. Opening it with a Superior Lair Key will randomly drop Mythic Uniques and Pandemonium Fragments, the exclusive upgrade material for Mythic Uniques. Compared to other events and activities, the drop rate for Corrupted Reaper's chest is relatively high.

Therefore, Mythic Uniques 3.0 system in Diablo 4 Season 14 only allows players to equip one Mythic Unique Item that they crafted and upgraded themselves. If players want to save gold and materials later in the game, they can repeatedly farm Corrupted Reaper to obtain more Diablo 4 Unique Items and Pandemonium Fragments.

Even Mythic Uniques you don't need can be dismantled for other materials or sold on the market to players who need them for Gold.

Therefore, Deathtoll Chamber is arguably one of the most crucial nodes in Diablo 4 Season of Death Awakening, serving as a bridge between the previous and subsequent phases.

Upgrading Pandemonium Ruptures combat to its final stage guides players back to Pandemonium Ruptures to farm keys for the final chest rewards, creating a cycle of Ruptures - material collection - entering Deathtoll Chamber - defeating Lair Boss - obtaining upgrade materials - farming Ruptures again.

In addition to the aforementioned season mechanics, the new season also features many gameplay and class changes. Whether Diablo 4 Season 14 can be a groundbreaking departure from Blizzard's previous style remains to be seen; stay tuned for its official launch on June 30th.

Add POECURRENCY.com as a preferred source on Google
Table of Contents
      backup
      live chat loadings