>>531105094
he appears for the first time in main story in v3c4, however he is introduced first and earlier in a raid story
there are several raid stories:
https://www.youtube.com/playlist?list=PL3D3Z6gWVT6Ayx8jcj3fYDrRgAs_bkn4C
See: Total Assault

linking because afaik these only appear when raids appear, and there are so many fucking bosses, and they do not frequently rotate. You're best off reading them this way