To get to him you have to do the flying glitch with sunbreaker and twilight garrison and try to get WAAAAY under atheon's platform.
This only works if you've done a flawless run so far in VoG and killed 7 Gorgons.
Oh yeah! And his name is[spoiler]Guy Fieri. [/spoiler] He is a bullet sponge and he has solar burn weapons.
Killing him is worth it for that free pass to flavortown though.
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Damn dude.