Efficient ancestral and mythic unique farming in Diablo 4 Season 15 is less about charging into the hardest fight and more about keeping a clean loop. Belial matters because his reward hoard lets you select the loot pool of another Lair Boss after the battle. That choice can save hours when a build needs one missing item. Before you start, decide which boss table suits your character, then keep D4 items in mind when comparing potential upgrades. The real gain comes from spending every key with a clear target, not from running the palace without a plan.
Build the Key Supply First
Do not treat standard Lair Keys as spare currency. Helltide events and Tortured Gifts are the steady starting point, so fold them into normal sessions instead of waiting until the stash is empty. Use those keys on bosses such as the Beast in the Ice, Grigoire, or Lord Zir. Their hoards can trigger a surprise Belial ambush. The fight is less demanding than the main encounter, but it is the important step because the ambush can award Superior Lair Keys. Seasonal Journey rewards may add more, and a Lair Key Ring is worth keeping if it appears. Build a small reserve before switching to a dedicated run.
Make the Palace Fight Comfortable
Once your Superior Lair Keys are ready, head to the Palace of the Deceiver in the Amber Sands, west of Tarsarak. The altar opens the Belial encounter on Torment I and above, and starting the fight does not consume a key. That makes the palace a good place to practise. Watch the claw sweeps, keep moving when poison pools overlap, and leave room to dodge the tracking waves. You do not need a flashy setup. A build with steady damage, mobility, and solid poison resistance will usually clear the stagger phase faster and make the whole rotation feel less punishing.
Use Each Hoard With Purpose
After Belial falls, his hoard costs one Superior Lair Key. Do not open it on autopilot. Pick the boss pool that matches the upgrade you are chasing, then repeat the same choice only while it still serves the build. A quick pre-run check keeps the group moving.
Confirm the target unique before entering.
Keep enough keys for the next rotation.
Clear the ambush bosses without wandering.
Keep the Rotation Moving
The best results come from rhythm rather than one lucky run. Farm standard keys during Helltides, clear the lesser bosses in a tight circuit, and save Superior Lair Keys for the loot pool that matters most. If your group slows down, split the work or shorten the route; waiting around costs more than a slightly weaker build. You will soon see which encounters feel efficient for your class. When a useful drop is close, checking D4 items buy can help you judge whether the next run is worth the time, then get back to the palace and keep the cycle going.
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