Risk of Rain 2 Alloyed Collective has a traditional final boss, but also a secret true final boss, which you can face right after beating the Solus Wing. Since this is a secret, getting to it has a few key steps to follow, but here is how you can reach it.
Reach the True Final Boss in Alloyed Collective – Solus Heart
After reaching and defeating the regular final boss of Risk of Rain 2: Alloyed Collective, Solus Wing, you need to take the portal through his eye to the Hidden Realm: Computational Exchange, where you can make an offering to a large Solus Unit.
