Underrail Forum
Underrail => General => Topic started by: Sjolund on July 16, 2026, 09:14:37 am
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Diablo 4: Lord of Hatred has introduced several new systems that make endgame farming far more rewarding, but one resource remains at the center of everything: Lair Keys. These keys are required to access boss encounters that drop some of the best gear in the game, and without a reliable supply, your progress can slow down dramatically. Fortunately, there are multiple ways to gather both Lair Keys and Greater Lair Keys efficiently. Whether you are hunting Mythic rewards or upgrading your collection of D4 items, understanding these methods will save you a tremendous amount of time.
Unlock and Level Your Mercenaries First
The easiest long-term source of Lair Keys begins with the Mercenary system. As soon as you unlock your companions, recruit Subo through the early questline and start leveling him immediately.
Mercenaries provide combat support, but their progression rewards are even more valuable. As Subo gains levels, he grants currencies, resources, and eventually a special Boss Summoning reward. Your goal is to reach at least Level 8.
Once unlocked, this reward enables access to Boss Summoning Caches through the Bartering system. From that point on, you can begin accumulating Lair Keys passively while continuing your normal gameplay activities.
Use the Bartering Vendor Efficiently
After unlocking Boss Summoning, travel to Tamis and visit the Bartering Vendor.
Many players overlook this merchant, focusing only on equipment upgrades. However, the real prize is the Boss Summoning Cache. These cache icons often contain multiple Lair Keys and can quickly become your primary source of keys.
If you have been saving barter currency, now is the time to spend it. Purchase every available cache, then refresh the vendor inventory whenever possible. The first refresh is usually free, while additional refreshes cost currency.
By repeating this process, players can build a substantial stockpile of keys with minimal effort.
Helltides Are Excellent for Active Farming
For players who prefer constant combat, Helltides remain one of the best activities in the game.
Before entering a Helltide, invest several points into the middle branch of your War Plans progression until you unlock the passive related to the Pangs of Jeweled Fiend.
This upgrade allows these elite enemies to spawn alongside Hell Worm encounters. Defeating them provides additional loot and significantly increases your chances of finding Lair Keys.
Because Helltides feature nonstop enemy spawns and frequent elite encounters, they are one of the fastest ways to collect large numbers of keys.
Follow a Consistent Farming Route
Randomly wandering through a Helltide is far less efficient than following a planned route.
Experienced players usually rotate between known Hell Worm spawn locations. Since these enemies respawn at predictable points, maintaining a loop allows you to minimize downtime and maximize elite kills.
A good Helltide rotation provides:
Lair Keys
Legendary equipment
Seasonal materials
Crafting resources
Experience
Repeating the same route throughout the event can generate an impressive number of keys in a relatively short amount of time.
Turn Standard Lair Keys into Greater Lair Keys
Once you have accumulated plenty of regular Lair Keys, begin using them on Lair Bosses that drop loot useful for your character build.
After defeating a boss, spend a standard key to open the reward chest. Besides receiving class-specific gear, you also have a chance to obtain Greater Lair Keys.
This creates a natural progression loop: standard keys lead to boss kills, and boss kills can reward the greater keys needed for even more challenging content.
Unlock Bonus Portals for More Rewards
Another valuable War Plans upgrade increases your chance of opening bonus portals after completing boss encounters.
These portals transport you to additional arenas filled with tougher enemies and multiple bosses. While the fights are harder, the rewards are significantly better, including extra Greater Lair Keys and higher-quality loot.
Players capable of consistently clearing these bonus stages will progress through the endgame much faster.
Farm Belial Whenever He Appears
Belial is one of the most rewarding encounters currently available for Greater Lair Key farming.
Whenever he spawns after a standard boss run, take advantage of the opportunity. Defeating Belial often rewards several Greater Lair Keys along with valuable equipment and crafting materials.
Since his appearance is based on chance, the best strategy is simply completing as many regular boss runs as possible to increase your odds.
Challenge the Toughest Bosses
After building a healthy reserve of Greater Lair Keys, begin tackling the highest-level bosses available.
These encounters are considerably more difficult, but they offer access to some of the rarest rewards in Diablo 4, including Mythic Uniques, powerful Legendary items, and valuable crafting materials.
Consistent farming is the key. Even though Mythic drops remain rare, repeated runs dramatically improve your long-term chances of obtaining one.
Final Thoughts
The most effective way to farm Lair Keys in Diablo 4: Lord of Hatred is to combine multiple systems rather than rely on a single activity. Level Subo to unlock Boss Summoning rewards, spend barter currency on Boss Summoning Caches, optimize your Helltide routes, and convert standard keys into Greater Lair Keys through boss runs. Bonus portals and Belial encounters further increase your efficiency, allowing you to challenge tougher content and earn better rewards. By following these strategies consistently, you will always have enough keys to tackle Diablo 4's hardest endgame encounters while collecting powerful gear and accumulating Diablo IV Gold for future upgrades.
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