(Magma Snake) Shrieking Achte

Lore
Over time, Achte's skin burned away and reformed several times, eventually becoming harder than steel. However, as the lava could seep in through the cracks, his rage never abated in the least. He thrashed amongst the magma spouts, creating craters throughout the area and converting it into a completely barren wasteland.

Acquisition
?

Name origin
?

Additional Info
Boss during the Crystal Bonds Odyssey Event.