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Delving

From Primal Idle Wiki

Delving is the skill of descending into caves beneath the world. Each biome has one cave that opens once the biome is fully cleared, and delving into it grants Delving XP alongside materials, gems, and rare best-in-slot gear. Delving also governs the Excavation panel, where you spend Dig Site Maps to run fossil digs.

Delving levels run from 1 to 99. Higher levels unlock deeper caves and more Excavation dig slots.

How delving works

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A cave run resolves much like an expedition: it uses the same combat math (your gear plus your companion party against the cave's difficulty), fleeing works, and injuries can occur. But there are two important differences:

  • Torches fuel every run. Each delve consumes one Torch — a cheap crafted item — and the torch burns whether you win or lose. Unlike an expedition, the entry cost is paid the moment you step in.
  • Cave injuries hurt double. An injury from a cave takes about 60 minutes to heal, twice as long as a surface expedition injury (about 30 minutes). Cave difficulty sits between a biome's patrol and its Guardian.

Cave wins do not advance biome-clear progress and cannot defeat Guardians — clearing is done through Expeditions. Caves are purely a reward activity.

Caves and level gates

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Each cave requires the biome to be 100% cleared and a staggered Delving level.

Cave Biome Delving level Difficulty
Sunlit Grotto Grasslands 1 30
Rootway Hollow Redwood Wilds 10 70
Drowned Cavern Murkwater Swamp 20 100
Echoing Deep Cavern Depths 30 130
Cinder Vault Scorched Badlands 40 170
Tidewrack Cave Coral Shallows 50 195
Glacier Hollow Frozen Wastes 60 220
Ashen Gallery Ashen Peaks 70 260
Skyvein Chasm Skyreach Plateau 80 310
Vale Abyss the Sundered Vale 90 380

Rewards

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Every winning delve rolls several loot layers:

  • Cave materials (common) — Stalactite Chip, Glow Moss, Cave Pearl, Echo Shard. Common crate filler with decent sell value.
  • Gems (uncommon) — Rough Garnet, Deep Sapphire, Ember Topaz, and Sky Opal, tiering up by depth; pure Amber income.
  • Unique gear (rare, about 0.2% per win) — eight uncraftable best-in-slot pieces, each from a specific cave. See Caves for the full list.
  • Expedition Set pieces — the biome's set pieces drop from caves at roughly 0.8% per piece per win, faster than on patrols.
  • Arena Artifacts — a biome's cave is the only source of its Arena Artifact (about 1.5% per win), the key required to challenge the Arenas.
  • Dig Site Maps — caves are the best source of a biome's Excavation map (about 2.5% per win).

Torches

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Torches are made with an early Crafting recipe (around level 5) from fernwood, fiber, and resin, producing several torches per craft. Keep a stock on hand — a delve cannot start without one, and every attempt spends it.

Excavation

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The Excavation panel lives on the Delving page. Spending a Dig Site Map starts a real-time dig that delivers fossils, Delving XP, and rarely a creature skull. The number of dig slots you can run at once grows with your Delving level. See Excavation for details.

See also

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  • Caves — the ten caves and their unique gear.
  • Excavation — fossil digs, also run through Delving.
  • Weather — a Storm boosts Delving yields.