The volcano is full of stone platforms raised out of lava, as you progress through the level the lava's level increases.
Precursor Oracles, the Eco Seeker, Precursor Orbs are found in the Volcano.
Lava Armadillos are found in the Brinkal Volcano.
Drillbots are found in the Brinkal Volcano.
Drifters are found in the volcano.