Additional Rare Monsters

Additional Rare Monsters can spawn in Rare Monster Packs with larger pack sizes. Each Rare Monster in the Pack provides one modifier to the Pack's Minions. Additional Rare Monsters in Essence Packs also carry Essences.

Atlas passives

Dread Lieutenants
Rare Monster Packs in City Areas have a 75% increased chance to have an Additional Rare Monster
Survival of the Fittest
Rare Monster Packs in Desert Areas with Additional Rare Monsters instead have a single Rare Monster with doubled EffectivenessRare Monster Packs in Desert Areas have a 100% increased chance to have an Additional Rare Monster
Trapped Subordinate
Essence Monster Packs have a 50% increased chance to have an Additional Rare Monster