Source-checkedCreatures & NPCs

ExtendedBosses

by j1gA · for Valheim

Raid-style boss fights from vanilla parts only: HP phases, add waves, nests, lieutenants, shields, burn windows, threat - seen by every player, mod or not.

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7d agoLast updated
BepInExLoaders
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About ExtendedBosses

From Thunderstore

Raid-style boss fights from vanilla parts only: HP phases, add waves, nests, lieutenants, shields, burn windows, threat - seen by every player, mod or not.

ExtendedBosses

Raid-style boss fights for a group, from Eikthyr to Fader: HP phases, waves of adds, destructible nests, biome mini-bosses as lieutenants, shields that drop when the nests fall, burn windows, marks, ground hazards, resistance shifts and a threat table — built only from vanilla prefabs, animations and RPCs, so players without the mod see and feel the same fight.

| | | |---|---| | Eikthyr marks a player for lightning — spread out! | The Elder: roots under the marked player, a seed grows a new nest | | Eikthyr marks a player for lightning — spread out! | The Elder: roots under the marked player, a seed grows a new nest |

Phase announcements — every player sees them, with or without the mod

Phase announcements — every player sees them, with or without the mod

  • Profiles Light (bosses with reinforcements), Raid (default) and Hard, globally

or per boss; any boss can be set back to Vanilla. Everything switches without a rejoin.

  • Group scaling for 1–8 players: boss HP, adds, nests, stars and marks grow with the

group; solo stays doable.

  • Reward on top of the vanilla drop: coins and valuables, about a stack of each

material of the biome, about half a stack of the next biome's, and upgraded gear of the next biome for a group of 2+.

  • English and Russian messages; players without the mod get them in the language set

by GuestLanguage.

  • The server's settings apply to every client with the mod; config edits are picked up

without a restart.

Install on the host; guests do not need it. With the HostOwner mod (Bosses = true) the host keeps owning the boss whoever hits it. On a dedicated server every player who may own the boss needs the mod.

Early version: every boss is implemented, in-game testing is in progress — the numbers are starting values and all adjustable.

How a fight goes

The boss's own attacks and AI stay vanilla — everything below is added on top. Described for the default Raid profile.

  • Nests. As the fight goes on, the boss raises destructible spawners of its biome —

greydwarf nests, bone piles, eggs…

  • Shield. While the nests stand, the boss takes only a fraction of the damage.

Break them all → the boss is staggered and takes ×1.5 damage for 10 s. Ignore them and the shield crumbles on its own after a while — without the bonus.

  • Phases. About once a minute the boss enters a special state for 30 s — armor

against one damage type, regeneration, damage reflection… The message in the centre of the screen tells you how to answer it.

  • Marks. The boss names a player and 3 s later strikes where they stand. Step away

from your friends.

  • Lieutenants. Mini-bosses of the biome join the fight, along with waves of adds.
  • Reward. On top of the vanilla drop: coins and valuables, about a stack of each

material of the biome, about half a stack of the next biome's, and upgraded gear of the next biome for a group of 2+.

Light keeps the adds and nests but drops shields, phases and marks; Hard is Raid, denser and tougher. All the numbers: FIGHTS.md.

The bosses

Eikthyr — the tutorial

No shield and no phases: every mechanic once, gently.

  • Charge — every 20 s he dashes at double speed at a player who keeps their distance.
  • Skull pile — raises Meadows skeletons until you break it (it glows for players with the mod and drops nothing).
  • Lightning mark — the marked player is struck 3 s later.
  • Reinforcements: boars and necks, and a herd leader — a 2★ boar with triple health.

The Elder

  • Greydwarf nests hold his shield.
  • Roots — roots burst out around the marked player.
  • Seeds — his projectiles sometimes take root and grow a new nest.
  • Living bark (phase): Sap — only slashing hits (axes, swords) get through;

Back — armored in front, full damage from behind: the tank keeps him facing away from the group.

  • Shamans heal him — kill them first.
  • Reinforcements: a troll, a bear, greydwarf elites, a skeleton and a ghost.

Bonemass

  • Bone piles hold his shield.
  • Leeches come out of the water nearby; poison pools under marked players; his

hits leave you Wet, later Tared.

  • Merging — blobs crawl towards him from afar, and each one that reaches him heals

him. Intercept them.

  • Phases: Hardening — blunt barely hurts, fire does double: burn him. *Rot

vapour* — close hits are halved and poison the attacker: fight from range.

  • Reinforcements: an abomination, writhans, surtlings, elite draugr, a wraith and

swamp bats.

Moder

  • Ice stalagmites hatch drakes and hold her shield. More drakes fly in all fight long.
  • Ice nova under marked players — frost and slow.
  • Breath mark — she lands and fixes on the marked player for a few seconds.
  • Phases: Ice armor — while she is on the ground, ranged hits do a quarter: get

into melee. Ice spikes — every hit reflects part of its damage back as frost.

  • Reinforcements: a wolf pack (ulvs at night), cultists, a stone golem, a fenring.

Read the full description on Thunderstore →

Highlights

From source data

Loaders

Runs on BepInEx.

Footprint

Rated a light load on a server.

Last update

Its author last shipped an update 7d ago.

ExtendedBosses on Nxeon

From our catalogue
One-click install
Supported on Nxeon Valheim servers, for BepInEx servers. We download it from Thunderstore, place it, and restart the server.
Server side
Required on the server
Server type needed
BepInEx
Server load
light
Smallest plan we suggest
Valheim — 4 GB (4 GB RAM). This follows our own load rating above, not a benchmark.
Latest build
0.8.17, released 2026-10-27

Game versions by loader

LoaderGame versionsNewest
BepInEx

From 7 recorded builds of ExtendedBosses.

Recent builds

BuildReleasedGame versionsLoaders
0.8.172026-10-27n/aBepInEx
0.8.152026-10-25n/aBepInEx
0.8.142026-10-17n/aBepInEx
0.8.132026-10-17n/aBepInEx
0.8.112026-10-03n/aBepInEx
0.8.62026-09-26n/aBepInEx

Dependencies

Declared by the newest build that lists any. Required ones are installed with it on one-click installs.

Run ExtendedBosses on a Valheim server

Pick a server or deploy a new one above; it is installed in one click.

What kind of mod it is

From the catalog
Listed on Thunderstore as “Content”

Creatures & NPCs

Adds or changes creatures, NPCs and how they behave.

Runs on your server

From source side support

Thunderstore lists ExtendedBosses as required on the server. Check its Thunderstore page to see whether players need it too.

Compatibility

Game
Valheim
Loaders
BepInEx
Runs on
Serverrequired on the server
Requires
One-click install needs a BepInEx server.

Verified at the source

  • ✓ThunderstoreOfficial listing, checked 2026-10-28Open ↗
  • ✓Authorj1gA, as published on Thunderstore
  • ✓LicenseNot published by the sourceFree

ExtendedBosses, answered

Generated from the mod’s own source data.

Do my players need to install ExtendedBosses?

Thunderstore lists ExtendedBosses as required on the server. Check its Thunderstore page to see whether players need it too.

Which loaders does it support?

BepInEx.

Is it free?

Yes. ExtendedBosses is free to download from Thunderstore.

How do I add it to my Nxeon server?

Use “Add to a server” on this page, or open NxLabs from your dashboard. We install it, restart your server and switch it on.

NxLabs

Run ExtendedBosses on a Valheim server.

Deploy in about a minute from $9.99 a month, then add ExtendedBosses in one click.