With those key points in mind, here is a closer look at each Season 2 boss encounter and how the farming system worked.
When Diablo 4 Season 2 (Season of Blood) launched in October 2023, it introduced five dedicated endgame boss encounters that gave players targeted farming destinations for high-end gear. Each boss required specific summoning materials and had a unique loot table tied to the strongest items available that season.
Echo of Varshan was one of the five Season 2 endgame bosses, encountered in the Forgotten Depths. Players summoned him using materials collected through seasonal content, and defeating him rewarded items sought after for endgame builds. Varshan also appeared in Season 1, making him one of the longer-running seasonal boss encounters in the early Diablo 4 rotation.
Lord Zir was the primary antagonist of Season 2 and the thematic centerpiece of the Season of Blood storyline. As an ancient vampire lord, Zir demanded summoning materials earned through the season's open-world activities. His encounter capped the seasonal narrative and dropped unique items for players who defeated him.
The Beast in the Ice occupied a glacial zone and required Distilled Fear collected from Nightmare Dungeons to summon. The fight placed demands on cold-resist builds and rewarded players with unique items from its own loot table. Like the other Season 2 bosses, it represented a targeted farming objective for players who had reached the endgame.
Grigoire the Galvanic Saint was the lightning-themed endgame boss of Season 2, summoned using Living Steel harvested from Helltide Chests during Helltide events. The fight required mobility and lightning-resist preparation to handle his area-of-effect attacks. Grigoire dropped unique items coveted by players building toward the season's hardest content tiers.
Uber Duriel was the pinnacle endgame encounter of Season 2 and the primary source of Uber Unique items, the rarest and most powerful gear tier in the game at that time. Accessing Uber Duriel required materials collected by defeating the other four endgame bosses, meaning players had to complete the full boss circuit before facing him. Each Uber Unique had a very low drop rate even from Duriel, making repeated farming necessary for players chasing specific pieces.
Season 2 established the boss summoning loop that subsequent Diablo 4 seasons refined, each introducing a new roster with updated material requirements.
The standard Season 2 endgame loop was to farm all four pre-Duriel bosses to accumulate the summoning materials for Uber Duriel. Build choices mattered across the circuit: each boss had specific damage types and mechanics that rewarded the right resistances and mitigation. Players looking for current boss farming can browse Diablo 4 boss carry services for the active seasonal roster.
Season 2 featured five endgame boss encounters: Echo of Varshan, Lord Zir, Beast in the Ice, Grigoire the Galvanic Saint, and Uber Duriel. Each required specific summoning materials and offered a distinct loot pool tied to the season's gear progression.
Uber Duriel required summoning materials obtained from defeating the other four Season 2 endgame bosses: Echo of Varshan, Lord Zir, Beast in the Ice, and Grigoire. Players farmed those bosses and combined their drops to summon Uber Duriel for a chance at Uber Unique items.
Uber Unique items were the highest gear tier in Diablo 4 during Season 2, offering the strongest affixes and base stats available. They dropped only from Uber Duriel and were rare enough that most players farmed the boss circuit many times before obtaining a specific piece they wanted.
Each Season 2 boss had its own summoning material: Distilled Fear for the Beast in the Ice, Living Steel for Grigoire, and boss-specific drops for Varshan, Lord Zir, and Uber Duriel. The Uber Duriel materials came from defeating the other four bosses, forming the loop that structured endgame progression for the season.
The Diablo 4 boss roster evolved across seasons and through the Lord of Hatred expansion in April 2026. The specific Season 2 summoning system and material types from 2023 have been updated. Check the current game client or WowCarry's Diablo 4 category for the active boss lineup.
Players maximized Uber Duriel access by running the other four bosses on cooldown, banking their summoning materials, then summoning Duriel in dedicated runs. Joining a group or carry session helped spread the farming load across multiple characters and material types simultaneously.
Last reviewed 2026-06-17 against Diablo 4 Season 2 (Season of Blood, October 2023) — Maintained by WowCarry's Diablo 4 team.
