How to Unlock Chaos Perks in Diablo 4 Season 10

There are two main methods to unlock Chaos Perks in Diablo 4 Season 10: progressing through Diablo 4 Items the Seasonal Reputation system and defeating the Season's new boss, Bartuc, Lord of Chaos.

1. Progressing the Season 10 Reputation Track

As you advance through Season of the Infernal Hordes, you'll earn Reputation points by completing seasonal events and activities. These points unlock Chaos Perks of varying rarity - Magic, Rare, and Legendary.

You can earn Reputation from:

Infernal Hordes (the main seasonal activity)
Chaos Rifts inside Helltide events
Nightmare Dungeons with Chaos modifiers
Seasonal objectives and contracts

Each tier of the Reputation path offers a new Chaos Perk or upgrade currency. These perks apply to all your characters during Season 10, allowing easy experimentation across classes.

2. Defeating Bartuc, Lord of Chaos (for Unique Chaos Perks)

The real challenge lies in acquiring Unique Chaos Perks, which are exclusive drops from Bartuc, Lord of Chaos - the final boss of the Infernal Hordes.

How to unlock Bartuc:

You'll first need to clear several Infernal Horde tiers.
At the end of each run, you can either fight the Fell Council or increase the challenge by facing Bartuc.
Bartuc only appears on Torment I difficulty or higher.

Guaranteed drops:

On Torment III and IV, Bartuc guarantees at least one Unique Chaos Perk or Unique Chaos Armor piece.

Bartuc's fight is one of the hardest in the game, but it's also one of cheap d4 mats the most rewarding for players aiming to buy Diablo IV Items alternatives through grinding rather than trading.