Bonemass is the third boss you’ll encounter in Valheim. One of the legendary Forsaken that you have been sent to defeat by Odin himself. Bonemass is a perilous and poisonous foe which you’ll need to be very well-prepared to tackle. Our Valheim Bonemass boss fight guide will explain exactly how to locate, summon, and kill Bonemass. We’ll also walk you through the unique rewards you’ll earn after killing it.
Valheim Bonemass location
Bonemass, like other Valheim bosses, did not appear anywhere in the world at the beginning of the game. Instead, he must be summoned at the Bonemass Mystical Altar, which is scattered throughout every map of Valheim. To find the nearest Mystery Altar, you need to find and interact with Vegvisir’s glowing red runestones that will replicate the location of the altar on the map.
The bones are in the swamp biome, so you should look for runes in the swamp, specifically in the Sunken Crypts found in certain Swamp biomes. To defeat these sunken tombs, you must defeat the ancient boss The Elder. Once the grave is marked on the map, head there to search for the mysterious altar of Bonemass, the huge skull protruding from the tombstone.
How to summon Bonemass
Like all bosses, to summon Bonemass, you will have to sacrifice yourself on his mysterious altar. In this case, you need to place 10 dead bones on the altar to summon the boss to the world. You may need to explore several sunken crypts to find 10 withered bones, but once you find them, you must return to the Altar of Bonemas.
Place the bone in your hotbar, then press the corresponding number key and place the cursor on the altar to summon Bonemas and start fighting the boss.
Valheim Bonemass boss fight walkthrough
If you’re not fully prepared for this boss battle, Bonemass will rip right through you, so I suggest you prepare by finding and melting enough iron to make a Iron Mace, which is especially useful for this battlebecause Bonemass is weak against blunt attacks.
You also need a lot of health and stamina, so I recommend that you eat Cauldron-tier foods to reach a maximum health value of about 150. You also take some steps to resist the poison, because this will definitely come in handy in this battle. As for armor, the stronger the better. Ideally, at this point they will transfer you from leather or troll leather armor and put on bronze or iron armor.
As for the boss fight itself, Bonemas is a great big blob who likes to give birth to enemies and spit poison. If you get close to it, it will hit you, you have to make sure to stop it or avoid it, but it is indeed poisonous and will kill you if there is.
When Bonemass clutches its stomach and rears its head, the first poison attack occurs. A large cloud will appear around the boss, poisoning the players trapped inside. When Bonemass throws a clump of itself to the nearby ground, another poison attack occurs. The mass will spread poison and summon Blobs and skeletons where it lands.
Therefore, I recommend that you keep the Stagbreaker and Iron Maceto the hotbar, because the Stagbreaker is very suitable for quickly dealing with groups of small enemies. With good gear, health and anti-poison, as long as you are not in the poison for a long time, the poison shouldn’t be too punishing. As long as you are not in danger of being poisoned, keep glued to Bonemass, as long as you have perseverance, you can defeat him and get the rewards.
Bonemass Forsaken Power & loot drops
After defeating Bonemass, head to the wreckage to collect the fallen items – a Bonemass trophy to unlock the forgotten power and the Wishbone. Return the trophy to the circle of stones at spawn and place it on the third stone hook, then interact with the stone to obtain Valheim’s third forgotten power. This power can resist physical damage (blunt / slashing / stabbing), which means that you are less immune to such attacks.
Equipped with a Wishbone (equipped in a special armor slot, so you don’t need to use it in the hotbar), if there is something buried nearby, a green spark will appear around your character. Follow the spark and dig with a pickaxe to find treasures, including rare deposits of silver ore.