Valheim Boss Progression and Boss Order: Eikthyr to Fader

Valheim's whole progression loop is built around seven Forsaken bosses, and the order you fight them in is fixed to the order you unlock biomes: Meadows, Black Forest, Swamp, Mountain, Plains, Mistlands, and Ashlands. Each boss gates the next tier of metal and gear, drops a trophy that unlocks a permanent world buff, and — per the wiki — "increases world difficulty" the moment it dies. Below is every boss's summoning requirement, base HP, base damage, and Forsaken power exactly as the wiki's boss table lists them, biome by biome.
How Valheim's boss progression actually works
Bosses, "also known as the Forsaken, can be summoned by offering specific items (hinted by the Runestones) at their specific spawn site," and "a boss site is automatically marked on the player's map by reading the runestone in the specific biomes." Every boss has multiple possible spawn locations in its biome — the table gives a location count per boss, not a single fixed coordinate.
Killing a boss isn't just loot: "each Forsaken is guaranteed to drop a special trophy when defeated that can be returned to the Sacrificial Stones to unlock a new Forsaken power" — a passive buff you can toggle on at any Sacrificial Stones altar afterward. The same kill also raises the world's overall difficulty tier, which is why rushing bosses out of order (or skipping the Meadows/Black Forest grind entirely) tends to backfire: you'll be fighting harder-scaled regular creatures without the gear a proper progression run would have given you by that point.

Meadows to Black Forest: Eikthyr and The Elder
Eikthyr is the entry boss: 3 summoning locations in Meadows, summoned with 2 Deer trophies, at 500 base HP and 20 Pierce + 15 Lightning base damage. His Forsaken power is "60% reduced stamina usage for running, jumping, and swimming" — he's immune to Stagger, and the table lists no documented weakness or resistance for him.
The Elder follows in Black Forest: 4 summoning locations, 3 Ancient seeds, and 2500 base HP — that's 2500 ÷ 500 = 5x Eikthyr's health pool. Base damage is 35 Pierce + 60 Blunt. His Forsaken power is "+60% Chop and Pickaxe damage increase, +30% health regeneration increase," which is exactly why beating him is the intended gate before serious woodcutting/mining runs into Swamp-tier resources. The Elder is weak to Fire and immune to Poison, Spirit, and Stagger — no resistance is documented in the table.
Swamp to Mountain: Bonemass and Moder
Bonemass guards the Swamp: 5 summoning locations, 10 Withered bones, and 5000 base HP — 2x The Elder's pool. Base damage is 80 Blunt + 50 Poison, or 130 Poison on his ranged attack. His Forsaken power is "Slightly resistant (-25%) VS pierce, slash, and blunt damage, -100% block stamina cost, +5 stamina returned per block" — a defensive buff that pairs directly with the melee-heavy Mountain biome ahead. Bonemass is weak to Blunt and Frost, resistant to Fire/Pierce/Slash, and immune to Poison and Stagger.
Moder waits in the Mountain: 3 summoning locations, 3 Dragon eggs, and 7500 base HP — 7500 ÷ 5000 = 1.5x Bonemass. Base damage ranges from 30 Pierce + 200 Frost up to 110 Slash / 200 Frost. Her Forsaken power is "Always tailwind when sailing, +300.0 increased carry weight, +10% increased movement speed, Resistant (-50%) vs frost" — the sailing buff alone is why most players beeline Moder before attempting long ocean crossings toward Plains or Mistlands. Moder is weak to Fire and immune to Frost, Spirit, and Stagger; no resistance is documented.

Plains to Mistlands, Ashlands, and beyond: Yagluth, The Queen, Fader

Yagluth rules the Plains: 4 summoning locations, 5 Fuling totems, and 10000 base HP (10000 ÷ 7500 ≈ 1.33x Moder). Base damage spans several attack patterns, topping out at 40 Blunt + 120 Fire. His Forsaken power is "Resistant (-50%) vs lightning, +25 Farming (skill), and +10% increased damage." Yagluth is resistant to Fire and Pierce, and immune to Poison and Stagger; no weakness is documented.
The Queen is Mistlands' boss: 5 summoning locations, and — unusually — a choice of summoning items, either a Sealbreaker or 3 Seeker soldier trophies. Base HP is 12500 (a 1.25x step up from Yagluth), with base damage reaching 150 Pierce on her hardest hit. Her Forsaken power is "+100% Eitr regeneration increase, -100% sneak stamina usage, and resistant (-50%) vs poison." She's resistant to Pierce and immune to Spirit; no weakness is documented.
Fader guards Ashlands: 5 summoning locations, 3 Bells, and 25000 base HP — exactly 2x The Queen, and 25000 ÷ 500 = 50x Eikthyr's starting HP pool across the whole progression. Base damage is almost entirely Pierce-based, up to 210 Pierce per hit. His Forsaken power is "+100% Adrenaline increase, 50% reduced stagger meter modifier, and resistant (-50%) vs fire." Fader is resistant to Pierce and immune to Fire and Spirit; no weakness is documented.
Beyond Fader, the wiki's boss table sourced for this article ends at Fader (Ashlands) and does not carry a Deep North boss row — so any Deep North final boss, including its name, HP, summon items, and Forsaken power, is undocumented in this source. This overview sticks to what the table actually lists rather than guessing at what comes next.
Read the Runestone in each new biome before you explore far — it marks the boss altar on your map immediately, so you can plan a supply run for summoning items before you're standing at the altar empty-handed. Stock every summoning item in full before you travel to the site; several bosses (Bonemass's 10 Withered bones, Yagluth's 5 Fuling totems) need bulk quantities gathered over multiple trips. Check each boss's documented weakness before you commit to a loadout — Bonemass, Moder, and The Elder all punish the wrong damage type. And bank every trophy at the Sacrificial Stones as soon as you get it — the wiki confirms a hung trophy unlocks its Forsaken power and that each boss kill raises world difficulty, but whether multiple unlocked powers stack together isn't detailed in this source.
Running your own Valheim server
Boss progression is inherently a shared-world event — the difficulty increase and the Forsaken power unlock apply to the whole world, so a dedicated server keeps every player's kill and every unlocked power in sync without anyone needing to be the "host" who's always online. A dedicated server also means the world persists between sessions for co-op groups working through Meadows-to-Ashlands progression together, and launch arguments can be tuned (world modifiers, crossplay flags) without touching the base game files.
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Conclusion
Valheim's boss order tracks its biome order exactly: Eikthyr in Meadows, The Elder in Black Forest, Bonemass in Swamp, Moder in Mountain, Yagluth in Plains, The Queen in Mistlands, and Fader in Ashlands, with HP climbing from 500 to 25000 across the run. Each kill drops a trophy for a Sacrificial Stones power and pushes world difficulty up a notch — so the safest route through the game is still the intended one: fight them in order, gear up on what each one drops, and treat the next biome's boss as the actual finish line for that tier.
