WeaponArts

Active abilities ("arts") keyed to the weapon in your hands. Press one key (default C) and the effect depends on what you hold:

Weapon	Art	Effect
2H sword	Onslaught	more damage for a window
1H sword	Bloodthirst	lifesteal from damage dealt
Battleaxe	Berserk	take less damage and regenerate HP
1H axe	Bleed	physical damage over time
1H spear	Rend	the target is exposed: more damage from every player
Pike	Impale	ignore resistances + extra damage
Atgeir	Crushing	every hit staggers (not bosses)
Knives	Envenom	strong poison on every hit
Fists	Fury	a critical hit on every blow
Bow	Focus	the next shots are critical
Crossbow	Piercing Bolts	bolts ignore resistances + extra damage
2H sledge	Rally	heal yourself and allies around
1H mace	Mend	heal allies around (the greydwarf shaman's green heal)
Staves	Eitr Surge	more magic damage
Tower shield	Taunt	pull the monsters around onto you and take less damage

Strength and duration grow with the weapon's tier and your weapon skill. Every art has its own cooldown plus a shared global cooldown.
Effects only ever touch creatures (PvP-safe); bosses take a reduced share and are immune to stagger.
Players without the mod see every effect (vanilla prefabs) and receive heals. With 09 Proxy enabled, a nearby modded player can also act for them: they use the /challenge emote or type art in chat.
The server's balance settings apply to every client with the mod.
English and Russian text (follows the game's language, or set 01 General > Language).
All settings live in BepInEx/config/j1ga.weaponarts.cfg; with BepInEx ConfigurationManager (F1) they apply in game without a restart.

Install on every player who wants the arts and on the host / dedicated server.

Source, full documentation and the changelog: https://github.com/tbsj1ga/WeaponArtsValheim

Developed with the help of an AI assistant (Claude by Anthropic); the design decisions, verification against the game code and in-game testing are the author's.