Enseda

The slaughterspine grand-daddying the thunderjaw was an impressive development - but it was also Earth-based. Same with the tremortusks. Thanks to that nightmare cliffhanger on HFW, Nemesis isn't Earth-bound.

Since it can obviously influence the cauldrons on Earth, and is drawing ever nearer (easier to hack firewalls established by Aloy, Sylens, and our "heroes"), I say that while we might include some familiar Earth-creature bots, we need to see some alien machines from the Sirius system.

The fact that that star is so insanely different from Earth would naturally demand very different creatures to survive or thrive in its ecosystems.

So I strongly recommend they include >>not bigger<<, but >>different, alien<< bots - small, medium, and big (for the bosses). Even hybrids, suggesting "guided evolution," if game budgets need to scrimp.