Valheim's first four bosses are not optional side quests. Eikthyr, The Elder, Bonemass, and Moder each drop the item that opens the next biome, and each one hands you a Forsaken Power when you hang its trophy at the Sacrificial Stones. Fight them in biome order, and never walk into an altar without the right resistance and food.
The boss order, at a glance
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| Boss | Biome | Summon offering | Key drop |
|---|---|---|---|
Eikthyr | Meadows | 2 Deer Trophies | Hard Antlers |
The Elder | Black Forest | 3 Ancient Seeds | Swamp Key |
Bonemass | Swamp | 10 Withered Bones | Wishbone |
Moder | Mountain | 3 Dragon Eggs | Dragon Tears |
Read the red-glowing Vegvisir runestones to mark each altar on your map. Every world has several altars per boss, so if one is far away, sail out and read another Vegvisir rather than marching across the whole map. Each boss also guarantees a trophy on death: that trophy is what unlocks the Forsaken Power, so do not leave it in a chest.
Eikthyr: the Meadows stag
Eikthyr is a giant electrified stag, and its altar usually stands close to spawn. The Vegvisir at the Sacrificial Stones points to it. Place 2 Deer Trophies on the altar to call it. It attacks with a ranged lightning bolt, a close-range electric stomp, and an antler ram. With 500 health, it falls to flint or early bronze gear: block its charges with a small wooden shield and strike between attacks.
The kill drops Hard Antlers, which craft the Antler Pickaxe. That pickaxe is the real prize: it lets you mine copper and tin, which starts the whole bronze age. Hang the trophy for a power that cuts running, jumping, and swimming stamina cost by 60 percent.
The Elder: the Black Forest guardian
The Elder is a towering tree-guardian in the Black Forest, and its Vegvisir hides inside Burial Chambers. Burn 3 Ancient Seeds in the altar offering bowl to summon it. Seeds drop from Greydwarf brutes, Greydwarf shamans, and the nests they guard. The Elder fires vine projectiles, stomps for area damage, and summons roots from the ground.
It is a tree, so fire is the answer. Fire arrows are the fastest way through its 2,500 health, and the stone pillars around the altar make good cover. The reward is the Swamp Key, which opens the Sunken Crypts where iron waits, plus a power that boosts chopping and mining damage and health regeneration.
Bonemass: the Swamp wall
Bonemass is a huge poison-belching slime and the first real wall in the game. Its Vegvisir appears inside Sunken Crypts. Summon it with 10 Withered Bones, dug from muddy scrap piles and looted in those crypts. With 5,000 health, heavy poison clouds, and constant self-healing, it punishes the wrong loadout.
Bring an iron mace: Bonemass is weak to blunt and frost.
Poison-resistance mead is close to mandatory. Do not skip it.
Clear its summoned skeletons and blobs before they pile up.
The kill drops the Wishbone, which pings buried silver in the Mountains and hidden treasure. The power grants 25 percent physical damage resistance and near-free blocking, and it stays useful long after the Swamp.
Moder: the Mountain dragon
Moder is a frost dragon summoned at a mountain summit. Look for its Vegvisir inside ruined stone towers near the peaks, then bring 3 Dragon Eggs from drake nests. Each egg weighs 200, so plan one trip per egg unless you have the Megingjord belt or friends to help carry.
The Mountain itself will freeze you without frost-resistance mead or wolf armor, so pack survival gear first. Moder has 7,500 health and alternates grounded claw swipes with airborne frost-breath barrages, so bring a strong bow for the air phases. The kill drops Dragon Tears for the Artisan Table, plus a power that gives a constant sailing tailwind, 300 extra carry weight, 10 percent move speed, and frost resistance.
How to prepare for all four
Three good foods, not one: health and stamina both scale with what you eat.
A portal and a bed near the altar. Boss runs are long, and the walk back is where runs die.
Farm the summon items before you are ready to fight, so the altar never waits on a drop.
In co-op, split roles: one player holds the boss attention while others clear adds.
Common mistakes
Summoning Bonemass without poison resistance, or Moder without frost protection.
Fighting The Elder in melee range, where its roots and stomps stack up.
Forgetting the trophy at the altar and sailing home without the Forsaken Power.
Once Moder falls, the Plains open up. That is where the late-boss chain starts, with Yagluth, The Queen, Fader, and finally Kall Fimbulbringer in the Deep North.