What Are Lair Bosses in Diablo 4?
Lairs are short, instanced dungeons that feature a single boss encounter. They are designed as Diablo 4 Items high-reward, high-risk content that scales with your level and World Tier. Unlike regular dungeons, lairs can appear in semi-random locations across the map and reset periodically, encouraging regular exploration.

Where to Find Urivar and Harbinger of Hatred
Urivar, Scourge of the Forgotten Depths
Location: Urivar is often found in lairs located in Hawezar or the Dry Steppes.

Appearance: This grotesque amalgamation of decaying flesh and void magic towers over the player and summons spectral clones to assist in battle.

Combat Style: Urivar favors shadow and decay damage, with heavy reliance on DoTs (damage-over-time effects) and teleportation. His most dangerous move, Abyssal Spiral, deals massive AoE damage and can one-shot unprepared players.

Tips to Defeat Urivar:

Equip Shadow Resistance gear or potions.

Focus on cleansing mechanics if your class supports it to remove debuffs.

Bring a stun or interrupt skill to cancel his Ritual of Ruin cast.

Harbinger of Hatred
Location: This lair boss is often encountered in the Scosglen or Fractured Peaks regions, emerging from corrupted ley lines tied to Mephisto's lingering influence.

Appearance: A terrifying, demonic figure cloaked in cheap D4 materials blood-red robes, surrounded by auras of hatred and corruption.