MW3 - Infinite Cosmos

To unlock the STG44 Infinite Cosmos blueprint in MW3 Zombies, players must defeat the Entity’s Echo during the Dark Aether Ascension by completing the first phase of the Entity Boss fight.

To overcome the waves of enemies, it’s advisable to stock up on RGLs, Dead Wire Detonators, and decoys. A wonder weapon like the Scorcher can also help expedite the mission. Additionally, having essential support items like armor plates and equipping high-tier weapons, such as a Tier 3 Pack-a-Punch, is highly recommended.