If you're chasing better gems in Diablo 4 Season 15, Hell's Legacy, start with the destination rather than your build. Refuge of the Lost, in Skovos's Athanos region, offers a farming loop built around two bosses: the Galvanized Mauler and the Molten Conjurer. For players comparing upgrades across their D4 items, that paired encounter is the main attraction. Both bosses can contribute to your gem haul, though you shouldn't expect Grand Gems every time. Some runs produce Royal Gems instead. Think repeatable chances, not a guaranteed payout.
Why Warlock changes the route
The Warlock's advantage isn't simply stronger damage. It's the time you can save before reaching those bosses. Normally, Refuge of the Lost asks you to clear enemies from its opening section, then release prisoners farther inside. Those jobs stretch out every attempt. The route described here uses Rampage near each locked gate to move through without completing those objectives. That turns the dungeon into a much shorter trip. Other classes can finish it, but this particular approach depends on the Warlock's movement interaction rather than ordinary clearing speed.
Keep the repeat runs simple
Head for the first gate, position yourself close to it, and use Rampage to cross. Do the same at the second gate, then continue toward the arena. Once you've arrived, place a custom map marker near the exit so you aren't searching for your way out after the fight. Defeat both bosses, collect the gems, and leave before resetting the dungeon through the map interface. Don't judge the route on one lucky clear. A few repeated attempts will give you a better sense of its pace and returns.
Mark the exit before starting repeated runs.
Collect both bosses' drops before leaving.
Reset outside, then repeat the route.
Know what your crafting target costs
Grand Gems are the starting materials, not the end of the process. Take five to the Horadric Cube to make one Horadric Gem. Five Horadric Gems then combine into one Flawless Horadric Gem. That means you're working toward twenty-five Grand Gems for each top-tier result through this sequence. Keeping that number in mind makes planning easier. Rather than crafting after every trip, gather a useful batch first. You'll spend less time interrupting the dungeon loop and have a clearer view of how much more you need.
Make the loop fit your goals
The useful question is whether this route helps finish the upgrades you actually want. Set a gem target, watch your results, and stop when the next crafting batch is ready. If you're also considering whether to buy cheap D4 items, treat that as a separate equipment decision rather than a replacement for understanding gem progression. Keep your dungeon routine straightforward: reach the arena, defeat both bosses, collect everything, and reset. Less wandering gives you more time for the encounters that matter.