Diablo 4 Season 8 All Boss Powers & Effects (How to Unlock, Use & Upgrade)

Diablo 4 is now on Season 8: Belial’s Return and a new feature has been added this season, which is Boss Powers.

Boss Powers are types of upgrades that you can equip to provide you with new effects and modifiers that will trigger depending on certain conditions.

With a total of 24 Boss Powers to choose from, there are now even more buildings that you can create with your favorite classes in the game.

How To Unlock Boss Powers?

Boss Powers will be unlocked during the Seasonal Questline during the first quest called A Deceitful Incursion, which is where you encounter Belial as a Mysterious Demon.

After Belial fails to convert you into one of his minions, you slay the Apparition of Kirma, providing you with your first Boss Power (Kirma’s Sparks) that can be used.

This also unlocks the Boss Power Menu, and you can later view the Boss Powers that you have and equip them there.

How To Get More Boss Powers?

New Boss Powers are obtained by defeating targeted Bosses that are found all around Sanctuary for the first time.

Once a targeted Boss has been defeated; you will obtain the specific Boss Power that is tied to them and may use it whenever you wish to.

Each of the Boss Powers has a specific Boss that needs to be defeated, and you can check this by viewing them in the Boss Power Menu.

How To Use Boss Powers?

To Use Boss Powers, open the Boss Powers Menu and you will see that there are 4 slots available. (1 Main Power Socket and 3 Modifier Power Sockets)

Equipping a Boss Power in the Main Power Socket will provide you activate its effects, causing it to trigger when its conditions are met.

Boss Powers can be equipped in Modifier Power Sockets to provide you with their Modifier Effects, which add bonus features to your character, or the Boss Effects equipped.

All Boss Powers & Effects

Magic Boss Powers

Allek’s Talons

Main Effects: Casting a Basic Skill applies Sparking damage over 4 seconds to enemies it hits.
Modifier Effects: Gain 5% Movement Speed, increased by 0.5% for each 1% Cooldown Reduction you have, up to a maximum of 11%.
Unlocked by defeating: Allek Apparition

Beastmaster’s Training

Main Effects: Whenever you cast a Summon Skill or call a Mercenary for Reinforcement, one of your Summons or Mercenaries Stuns surrounding enemies and gains 75% Damage Reduction.
Modifier Effects: Your Summons deal 5% more damage, increased by 0.25% for each 1% Bonus Critical Strike Damage you have from items and Paragon.
Unlocked by defeating: Beastmaster Apparition

Blackmailer’s Sabotage

Main Effects: Casting a Core Skill while you have a Barrier Knocks Down Close enemies, which can only occur on the same enemy every 5 seconds.
Modifier Effects: Whenever you gain Fortify, additionally gain an additional amount based on a percentage of the barrier.
Unlocked by defeating: Blackmailer Apparition.

Flesh Reaper’s Disruption

Main Effects: Damaging a Vulnerable enemy removes the Vulnerable and then Stuns them along with surrounding enemies. This stun applies 100% more Stagger to Bosses.
Modifier Effects: Gain 5% Vulnerable Damage, increased by 0.50% for each 1% of Crowd Control Duration Bonus you have.
Unlocked by defeating: Flesh Reaper Apparition

Hatred’s Embrace Haste

Main Effects: Casting a Shadow or Fire Skill grants increased Movement Speed for 3 seconds.
Modifier Effects: Gain 5% Critical Strike Chance, increased by 0.5% for each 1% Shadow Resistance from bonuses you have.
Unlocked by defeating: Hatred’s Embrace Apparition

Kirma’s Sparks

Main Effects: When you Evade, apply Sparking damage over 4 seconds to Close enemies.
Modifier Effects: Your Evade Cooldown is reduced by 5%, increased by 0.2% for each 1% Lightning Resistance from bonuses you have.
Unlocked by defeating: Kirma Apparition

Outlaw Sharpshooter’s Eye

Main Effects: Dealing Direct Damage to a Distant enemy Slows them and surrounding enemies for 5 seconds.
Modifier Effects: You deal increased damage to Enemies the further they are from you.
Unlocked by defeating Outlaw Sharpshooter Apparition

Sinerat’s Flames

Main Effects: Using a Mobility Skill Burns Close enemies for Burning damage over 4 seconds.
Modifier Effects: Gain 5% increased damage to all Elements. For each 1% of an Element’s Resistance from bonuses, gain 0.2% increased damage for that Element.
Unlocked by defeating: Sinerat Apparition

Skerg’s Toxins

Main Effects: When an enemy deals direct damage to you, apply Poisoning damage to them over 4 seconds.
Modifier Effects: When you take damage from a Damage Over Time effect, you have a 5% chance to be Healed instead, increased by 50% of your Poison Resistance from bonuses.
Unlocked by defeating: Skerg Apparition

Torusk’s Rage

Main Effects: Damaging a Crowd Controlled enemy makes them and surrounding enemies Unstoppable, but you gain increased Damage, Attack Speed and Movement Speed for 3 Seconds.
Modifier Effects: Gain 5% Attack Speed, increased by 0.25% for each 1% Damage to Crowd Controlled Enemies you have.
Unlocked by defeating: Torusk Apparition

Rare Boss Powers

Belial’s Crystal Decoy

Main Effects: When you Cast an Agility, Defensive or Macabre skill, spawn a crystal that Taunts enemies and explodes after 3 seconds that deals Shadow damage.
Modifier Effects: Activating your Main Boss Power Fears Nearby enemies for 0.75 seconds and deals Shadow damage to them.
Unlocked by defeating: Belial (Lair Boss Ambush) in Torment

Beast in the Ice’s Sleet

Main Effects: After Casting 3 Skills which apply Crowd Control or Stagger effects, shoot out sleet spikes that deal Cold damage and Freeze enemies for 2 seconds.
Modifier Effects: Your Main Boss Power now Chills enemies it damages.
Unlocked by defeating: Beast in the Ice (Lair Boss) in Torment

Grigoire’s Lightning Square

Main Effects: After you Cast a Core Skill, lightning tiles outward for 1.2 seconds dealing Lightning damage per strike.
Modifier Effects: Once per activation, damaging an enemy with your Main Boss Power Stuns enemies it hits.
Unlocked by defeating: Grigoire (Lair Boss) in Torment

Lord Zir’s Blood Pool

Main Effects: After you damage an enemy, spawn a pool of blood that deals Bleeding damage per second over 4 seconds. You can have up to 3 active pools.
Modifier Effects: Activating your Main Boss Power Heals you based on a percentage of your Maximum Life over 3 seconds.
Unlocked by defeating: Lord Zir (Lair Boss) in Torment

Read below how to summon Lord Zir:

Diablo 4 Lord Zir (Location, Summon, Drops & Fighting)

Varshan’s Life Steal

Main Effects: Every 1 second, attach a leeching beam to the closest enemy which deals Corrupting damage to them and restores 15% of your Maximum Life.
Modifier Effects: Activating your Main Boss Power inflicts Nearby enemies with Corrupting damage over 2 seconds.
Unlocked by defeating: Varshan (Lair Boss) in Torment

Urivar’s Lobbed Bombs

Main Effects: After you Cast an Ultimate Skill, lob 4 bombs that deal Fire damage. Gain 15% Cooldown Reduction.
Modifier Effects: Killing an enemy with your Main Boss Power reduces your Ultimate Skill’s Cooldown.
Unlocked by defeating: Urivar (Lair Boss) in Torment

Ashava’s Poison Breath

Main Effects: Hitting an enemy affected by Damage over Time spawns a wave of acid that deals 263 Poisoning damage over 4 seconds. Applies 10% more Poisoning for each 1% of the target’s current Life affected by Damage over Time.
Modifier Effects: Once per activation, damaging an enemy with your Main Boss Power also applies Poisoning damage to it over 3 seconds.
Unlocked by defeating: Ashava (World Boss)

Avarice’s Explosive Ore

Main Effects: When you gain an excess Primary Resource, spawn a Piece of Ore. After 2.5 seconds the Piece of Ore explodes, dealing Fire damage. You can spawn up to 3 Pieces of Ore at once.
Modifier Effects: Activating your Main Boss Power spends all your Primary Resource to increase its damage per Resource point spent.
Unlocked by defeating: Avarice (World Boss Boss)

Wandering Death’s Chest Beam

Main Effects: While Channeling a Skill, spawn a beam that deals Frostbite damage per second. Enemies hit take 50% increased damage from you for 1 second.
Modifier Effects: Your Main Boss Power instantly Executes Non-Boss enemies hit with less than a percentage of their Life. When you Execute enemies, you gain 25 Primary Resources.
Unlocked by defeating: Wandering Death (World Boss)

Legendary Boss Powers

Belial’s Eye Beams

Main Effects: After you drink a Healing Potion, gain 50% Damage Reduction for 2 seconds and summon eye beams that Corrupt and damage enemies over 3.5 seconds. Your Healing Potions become disabled for 5 seconds afterward. (Healing Potions may be drunk even at full Life)
Modifier Effects: Activating your Main Boss Power grants Stealth for 2 seconds. You deal increased Overpower Damage while Stealthed.
Unlocked by defeating: Belial (Lair Boss) in Torment

Lilith’s Wind of Hate

Main Effects: When you Cast a skill, attack enemies with a wave of spikes that lasts 2 seconds and deals Physical damage. Enemies take 60% increased damage from Wind of Hate each time it hits them, up to 300%
Modifier Effects: Hitting an Elite enemy with a Main Boss Power creates an inert Blister Clone with 10% of their Maximum Life for 15 seconds. Killing the Blister removes a percentage of the Elite’s Life. An Elite can have up to 1 Blister active at once, and a Boss can have up to 2 Blisters. Enemies with Resilience cannot spawn Blisters.
Unlocked by defeating: Lilith in Torment

Andariel’s Flaming Skull

Main Effects: After standing still for 1 second, summon a skull for 4 seconds that rotates around you and breathes fire that Burns enemies over 3 seconds.
Modifier Effects: Enemies take more damage from your Damage over Time effects.
Unlocked by defeating: Andariel (Lair Boss) in Torment

Duriel’s Burrow

Main Effects: When you Evade, you now burrow underground, immobilizing surrounding enemies for 5 seconds and dealing damage on your entry and exit. You deal damage every 0.25 seconds while burrowed. Evade’s Cooldown is increased by 4 seconds and Cooldown Reduction on Evade is 50% as effective.
Modifier Effects: Activating your Main Boss Power grants you increase Dodge chance for 5 seconds. Whenever you dodge an attack, Immobilize Nearby enemies for 3 seconds.
Unlocked by defeating: Duriel (Lair Boss) in Torment

Read below how to defeat Echo of Duriel:

Diablo 4 Echo of Duriel (Location, Summon, Drops & Defeating)

Harbinger of Hatred’s Volley

Main Effects: After damaging a Vulnerable enemy, shoot piercing projectile that last 1.3 seconds, dealing Fire damage and applying Vulnerable. Deals 40% increased damage to Vulnerable enemies.
Modifier Effects: Casting a Basic Skill while at Maximum Resource spends it all to make all Nearby enemies Vulnerable. Activating your Main Boss Power grants increased Vulnerable Damage for 5 seconds.
Unlocked by defeating: Harbinger of Hatred (Lair Boss) in Torment

How To Upgrade Boss Powers?

As you progress through the season, you will be able to upgrade your Boss Powers using Spectral Ash.

Spectral Ash can be earned by participating in a new event called Apparition Incursions or by defeating Lair Bosses.

Using Spectral Ash to upgrade your Boss Powers will provide them with stronger effects by increasing their stats.

Verdict

As you progress through Season 8, you will be coming across several bosses and thanks to the Boss Powers that you can acquire, there will be a lot of build options.

This also makes it more fun to target the mentioned bosses, giving you a reason to grind them even more aside from the loot you can get.

With several combinations of Main and Modifier Boss Powers, there are countless ways to make use of the new feature, and this has made the season more exciting.