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Diablo 4 Rune Merchant Tips from U4GM - Andrew736 - 02-11-2026
Lo and Ber runes can take a while to find in Diablo 4 Season 15, so it helps to have more than one activity on your route. If your build is ready for tough fights, start with Prime Evil Echoes. They offer a shot at valuable runes and other D4 items that can make the time worthwhile. Baal is the fight to target for runes: head to the hell version of Worldstone Keep on Torment XII or higher, where you can also look for the Annihilus charm. Belial in the Sanctum of Lies is another useful option, particularly if you're after Mythic items, Mythic Seals and Sparks.
Make Your Boss Runs Count
There's a catch with boss farming: the rewards have to be worth the time you spend getting them. A build that clears ordinary monsters quickly might still struggle against a single powerful target. Adjust your skills and gear for sustained single target damage before settling in for repeated runs. If Baal takes ages to bring down, don't feel stuck there. Spend some time in Kurast Undercity instead, pick up materials, and return when your damage improves. A faster fight leaves more room for another attempt, and those extra attempts can matter more than pushing a difficulty your character isn't ready to handle.
Bring Out the Cabochon Merchant
Before entering Kurast Undercity, open the War Plans tree and invest in Gutter Filth and Bauble Day. The first node gives each activated beacon a small chance to summon a Portal Prankster. The second brings out the Cabochon Merchant after the district boss dies, provided you've defeated a Prankster during that run. Hit every beacon you see and keep an eye out for the spawn. Once the boss is down, visit the merchant and check the stock. You'll find runes, gems and Prime Evil Splinters available for gold. Don't expect Lo or Ber to appear often, though; the more common runes can still be useful.
Turn Smaller Runes Into Bigger Ones
The merchant can refresh its inventory for 666 Forgotten Souls, but those materials disappear quickly if you're waiting for a particular rune. Look for Vex, Ohm and Lo instead. Two Vex runes and a Flawless Emerald become an Ohm in the Horadric Cube. Two Ohm runes and a Flawless Diamond make a Lo, while two Lo runes and a Grand Topaz make a Ber. Keep the required gems as you play, and check your inventory before spending on another refresh. Even without a direct Ber purchase, each useful rune moves you closer to the recipe.
Get More From Each Run
Use a Tribute of Harmony before opening the Undercity portal, then select the option for Invocation Runes. The completion reward gives you another chance to collect runes for your crafting plans. Chronicle of Nightmare Sigils can also open seasonal dungeons worth running for random unique runes and gems. Players who buy cheap D4 items may still want to keep these activities in their routine for the materials they need. Mix them with boss runs when the fights feel manageable, and save the runes you can put toward your next upgrade.