Expeditions

Expeditions are Primal Idle's core progression activity: auto-resolving survival runs into a chosen biome. Each expedition is powered by your gear and your companion party, resolves as an automatic fight (shown stage by stage on the Trail), and pays out relics, materials, and — with luck — rare gear. Guardian expeditions are the milestone challenges that unlock the next biome.

Expeditions are their own skill: running them grants Expeditions XP, and each expedition has a level requirement.

How an expedition works

Pick a biome. Each unlocked biome offers a repeatable patrol run and a Guardian challenge. You must have reached the biome (by clearing the previous Guardian) and meet the run's Expeditions level.
Auto-combat. A run resolves against a set difficulty value using your combat strength — your equipped gear plus your active companion party. Since v0.39.0 there's no coin flip: every run you're strong enough to attempt eventually wins. Come in under-geared and the fight simply runs longer — more exchanges, more food eaten, more time on the clock — while a loadout at or above the intended strength clears it in the fewest exchanges. The run plays out on the Trail as a four-stage encounter.
Win — or, rarely, die. Finishing a run is a win: it grants XP and rolls the run's loot. Grinding one out well past the intended gear line risks leaving a party member injured (healing on a timer) even on a win. The only way a run ends early is running out of food mid-fight: your party first tries a swiftness-boosted flee to pull you clear, and only if that fails do you die (see below).
Repeat. Patrols are fully repeatable and can be left running idle. Guardians are also repeatable, so you can farm a boss for its rewards after the first kill.

Every run reflects the biome's own Weather and Trail flavor as it plays out.

Death and reclaiming gear

Fights have real stakes. If a hit would drop you to 0 health and auto-eat has no food left, you die: that run's spoils are lost, and one random equipped piece is torn off and dropped where you fell. You revive immediately at full health.

Since v0.38.29 this can happen while you're away, too. An offline session now plays by the same rules as one at the keyboard — running out of food, or meeting a fight you can't match, can end in a death exactly as it would live. It can only happen once per away session, since dying stops the action that caused it; raids and sieges never run while you're away, so they can never kill you there.

Your gear isn't gone — it lies where you died:

The biome it fell in shows a marker. Winning expeditions there recovers the piece — the number of wins needed scales with the biome, from 3 in the Grasslands up to 8 in the Sundered Vale (10–12 in the Rifts), or
pay an Amber ransom to get it back instantly — the greater of 500 Amber or 5× the piece's sell value (four times that if it fell while you were away).

The best insurance is a well-stocked larder and picking the right auto-eat food for the biome you're fighting in.

Patrols

Patrols are the bread-and-butter runs. Each biome's patrol always yields that biome's relic, plus a chance at raw materials — a basic drop (bone, hide, or raw meat) on the early biomes, and the biome's own rare crafting materials further along the chain.

Biome	Patrol run	Level req.	Interval (s)	Difficulty	Outputs	XP
Grasslands	Patrol the Grasslands	1	20	15	Verdant Relic; Bone ×2 (30%)	35
Redwood Wilds	Trek the Redwood Wilds	15	30	55	Redwood Relic; Hide ×2 (30%); Ridgeplate ×2 (25%)	82
Murkwater Swamp	Wade the Murkwater	22	34	80	Bog Idol; Raw Meat ×2 (30%); Bogscale ×2 (25%)	108
Cavern Depths	Delve the Cavern Depths	30	40	100	Deep Geode; Crystal (15%); Deepchitin ×2 (25%)	140
Scorched Badlands	Cross the Scorched Badlands	38	44	105	Sunbaked Idol; Bone ×3 (35%); Wardstone Fragment (3%); Emberheart (3%); Slagplate ×2 (25%)	172
Coral Shallows	Dive the Coral Shallows	42	46	120	Pearled Conch; Wardstone Fragment (4%); Reefshell ×3 (25%)	192
Frozen Wastes	Cross the Frozen Wastes	45	50	140	Glacial Core; Wardstone Fragment (4%); Frostbound Hide (3%); Rimepelt ×3 (25%)	210
Ashen Peaks	Scale the Ashen Peaks	52	54	170	Ember Idol; Wardstone Fragment (4%); Emberheart (3.5%)	245
Skyreach Plateau	Ascend Skyreach Plateau	56	56	195	Cloud Jade; Wardstone Fragment (5%); Windquill ×4 (25%)	270
the Sundered Vale	Brave the Sundered Vale	60	60	220	Sundered Shard; Wardstone Fragment (5%); Apex Scale (4%); Valehide ×4 (25%)	305

Guardian bosses

Each biome is ruled by a single Guardian. Defeating a biome's Guardian for the first time unlocks the next biome in the chain, opening up its patrol and, once fully cleared, its cave. Guardians are much harder than patrols and reward a unique trophy item. They remain repeatable — the boss you farm for the best drop rates.

Biome	Guardian	Level req.	Interval (s)	Difficulty	Outputs	XP
Grasslands	Thunderfoot Matriarch	5	45	60	Thunder Crest	128
Redwood Wilds	Old Growth Tyrant	20	60	150	Tyrant Fang; Ridgeplate ×8; Blueprint: Sunpetal Hood (20%)	275
Murkwater Swamp	Murk Sovereign	27	66	200	Sovereign Scale; Bogscale ×8; Blueprint: Tidewoven Leggings (20%)	355
Cavern Depths	Hollow King	35	75	240	Hollow Crown; Deepchitin ×8; Blueprint: Sinewweave Vest (20%)	455
Scorched Badlands	Scorched King	41	80	260	Giga Tooth; Slagplate ×8; Blueprint: Starmetal Blade (20%)	530
Coral Shallows	Tide Leviathan	44	84	290	Tide Pearl; Reefshell ×12; Blueprint: Sunstride Saddle (20%)	610
Frozen Wastes	Frostmaw	50	90	320	Frost Heart; Rimepelt ×12; Blueprint: Heartwood Warbow (20%)	710
Ashen Peaks	Ash Tyrant	55	100	380	Tyrant Skull; Blueprint: Wardstone Bulwark (20%)	855
Skyreach Plateau	Sky Sovereign	58	108	420	Sky Plume; Windquill ×16; Blueprint: Gloomglass Visor (20%)	1000
the Sundered Vale	The Sundered One	65	120	500	Sundered Core; Valehide ×16; Blueprint: Emberheart Plate (20%)	1220

Percentages in the Outputs column show the chance of that drop; items without a percentage are guaranteed on every win. Intervals are base times before speed bonuses. Every run — patrol or Guardian — can also drop an Expedition Set piece and the biome's Dig Site Map; see Rewards, below, for those rates.

Rewards

Beyond the guaranteed relic or trophy, every winning expedition rolls extra loot layers:

Expedition Sets. Each biome has a themed six-piece equipment set (weapon, head, chest, legs, shield, trinket) that drops only from that biome's runs — never crafted or bought. Each patrol win has a 0.5% chance per piece; each Guardian win 2% per piece — four times the patrol rate — making the boss the fastest way to complete a set. Wearing a full set adds a bonus to your expedition strength, easing the jump to the next biome. Duplicates can be sold for Amber.
Trail Caches. Roughly one win in a handful turns up a Trail Cache, which pays out craftable companion gear tiered to the biome, a pile of Amber, or (rarely) a special relic saddle or barding. A Scout in your party raises the cache rate. See Trail.
Dig Site Maps. Runs occasionally turn up the biome's Dig Site Map, the key to an Excavation. Patrols drop them at 1.2%; Guardians at 5%.
Blueprint Sheets. Nine of the ten Guardians — every one but the Thunderfoot Matriarch — have a 20% chance to drop a blueprint sheet on a win. Studying it permanently unlocks that piece's recipe, the fastest route to a biome's forge-only gear.
Amber and materials. Sellable relics, gems, and set duplicates all feed your Amber income. Most patrols and Guardians also pay a trickle of the biome's own armour material and other rare crafting materials (Wardstone Fragment, Emberheart, Frostbound Hide, Apex Scale) — see the Outputs column above for exact rates.

Party roles

You can assign a role to each companion in your party to shape how expeditions resolve:

Attack — leads more of the Trail stages and counts for extra party strength.
Guard — reduces the damage your survivor takes.
Scout — improves flee chance and raises the Trail Cache drop rate.

Guardian Heat

Farming the same Guardian or rift boss over and over now heats up its biome: every boss win adds a heat stack worth +8% difficulty, up to 10 stacks. Heat cools down again over time (one stack every 2 hours) and — more usefully — each patrol win in that biome vents a stack. In practice this turns endless boss farming into a boss-and-patrol rotation; sustained farming settles around 4–6 stacks unless you interleave patrols.

The Rifts

Beyond the Sundered Vale, defeating the Sundered One tears open the Rifts — three expedition-only zones with repeatable boss fights, the Rift Shard currency, the Rift Bazaar, and the Riftforged set. See Rifts for the full chain.