Diablo 4: Belial's Return - Boss Powers Guide

Diablo IV Season 8: Belial's Return unleashes powerful boss abilities upon players. This season introduces a new mechanic: Boss Powers, mirroring the devastating attacks of Diablo IV's endgame bosses. Master Lilith's spike attack, Ashava's poisonous breath, or Belial's fearsome eye beams – the formidable abilities of Sanctuary's most challenging foes are now within your grasp.

However, acquiring these potent powers requires defeating their respective bosses. This guide details how to unlock and utilize these 24 unique Boss Powers, explaining their functionalities and upgrade mechanics.

What are Boss Powers?

Introduced in Season 8, Boss Powers are a seasonal mechanic. Defeating bosses grants fragments of their power, which can be equipped via your inventory's "Boss Powers" tab, similar to Season 2's Vampiric Powers. Each power comprises a Main effect (a powerful ability) and a Modifier (passive buffs or enhancements to the Main effect).

Unlocking Boss Powers

Boss Powers are earned by conquering Diablo IV's endgame bosses. The power's name indicates its source; for example, defeating Beast in the Ice yields its Sleet attack. Generally, Magic Powers drop from seasonal events, Rare Powers from lair bosses, and Legendary Powers from pinnacle bosses.

Upgrading Boss Powers

Upgrading requires Spirit Powder, a seasonal currency obtained from Apparition Incursions and other Belial-themed activities. Simply hover over the power and hold the upgrade button. Note that upgrade costs increase progressively.

All 24 Boss Powers

Belial's Return offers 24 powerful Boss Powers, ideal for endgame challenges. The values below represent Level 1 powers on a low-level character; these values significantly increase with character and power level progression.

Magic Powers
Boss Power	Main Effect	Modifier
Torusk's Rage	Damaging a crowd-controlled (CCd) target makes them and nearby enemies Unstoppable, granting you increased damage, movement speed, and attack speed for 3 seconds.	Gain increased attack speed, boosted by 0.25% for each 1% damage dealt to CCd enemies, up to a maximum.
Skerg's Toxins	When an enemy directly damages you, apply a potent poison effect over 4 seconds.	When taking damage over time, you have a chance to be healed instead, increased by a percentage of your poison resistance.
Sinerat's Flames	Using a mobility skill burns nearby enemies over 5 seconds.	Gain increased damage of all elements, further boosted by elemental resistances.
Outlaw Sharpshooter's Eye	Damaging a distant enemy slows them and nearby enemies for 5 seconds.	Deal increased damage to enemies based on their distance from you.
Kirma's Sparks	Evading applies a Sparking damage effect to nearby enemies over 4 seconds.	Reduce your Evade cooldown, further reduced by your lightning resistance.
Hatred Embraces Haste	Casting a shadow or fire skill grants increased movement speed for 3 seconds.	Gain increased critical strike chance, boosted by your shadow resistance.
Flesh Reaper's Disruption	Damaging a Vulnerable enemy removes Vulnerability, stunning the target and nearby enemies with increased stagger against bosses.	Gain increased Vulnerable damage, boosted by your crowd control duration.
Blackmailer's Sabotage	Casting a core skill with a Barrier knocks down nearby enemies (once every 5 seconds per enemy).	Gain a portion of your Fortify as Barrier.
Beastmaster's Training	Casting a summoning skill or calling a Mercenary stuns nearby enemies and grants damage resistance to one summon/mercenary.	Your summons deal increased damage, boosted by your bonus critical strike damage.
Allek's Talons	Casting a basic skill applies a Sparking damage effect to hit enemies over 5 seconds.	Gain increased movement speed, boosted by your cooldown reduction.
Rare Powers
Wandering Death's Chest Beam	While channeling a skill, spawn a beam dealing Frostbite damage per second, increasing damage taken by hit enemies.	Instantly executes non-boss enemies below a certain HP threshold, granting primary resource.
Avarice's Explosive Ore	Gaining excess primary resource spawns an ore that explodes after 2.5 seconds, dealing fire damage.	Spending primary resource increases damage based on resource spent.
Ashava's Poison Breath	Hitting a DoT-affected enemy spawns a wave of acid dealing poison damage, increased by the target's current DoT.	Damaging an enemy with the main power applies additional poison damage.
Urivar's Lobbed Bombs	After casting an ultimate skill, lob bombs dealing fire damage and granting cooldown reduction.	Killing an enemy with the main power reduces ultimate skill cooldown.
Vershan's Life Steal	Every second, attach a leeching beam to the nearest enemy, dealing corrupting damage and restoring HP.	Activating the main power inflicts corrupting damage to nearby enemies.
Lord Zir's Blood Pool	After damaging an enemy, spawn a blood pool dealing bleeding damage per second.	Activating the main power heals you over 3 seconds.
Girgoire's Lightning Square	After casting your core skill, lightning strikes outward, dealing lightning damage.	Damaging an enemy with the main power stuns hit enemies.
Beast in the Ice's Sleet	After casting 3 skills applying CC or stagger, shoot sleet spikes dealing cold damage and freezing enemies.	The main power chills damaged enemies.
Belial's Crystal Decoy	Casting an agility, defensive, or macabre skill spawns a crystal that taunts enemies and explodes, dealing shadow damage.	Activating the main power fears nearby enemies and deals shadow damage.
Legendary Powers
Harbinger of Hatred's Volley	After damaging a Vulnerable enemy, shoot piercing projectiles dealing fire damage and applying Vulnerability.	Casting a basic skill at max resource makes nearby enemies Vulnerable, and activating the main power grants increased Vulnerable damage.
Duriel's Burrow	Evading makes you burrow, immobilizing nearby enemies and dealing damage on entry and exit, and continuously while burrowed.	Activating the main power grants increased dodge chance and immobilizes enemies when dodging.
Andariel's Flaming Skull	After standing still, summon a skull that breathes fire, burning enemies.	Enemies take increased damage from damage over time (DoT) effects.
Lilith's Wind of Hate	Casting a skill attacks enemies with a wave of spikes dealing physical damage, with increased damage per hit.	Hitting an elite enemy creates a blister clone; killing the clone removes a percentage of the elite's life.
Belial's Eye Beams	After drinking a healing potion, gain damage reduction and summon eye beams that corrupt enemies, disabling potions for 5 seconds.	Activating the main power grants stealth, increasing overpower damage while stealthed.

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