There's still a lot of room for improvement, but I'll settle with this for now. Also, fuck those poison clouds.
Weapon:
Universus
Armor:
Star Knight Cap
Body: +4 Edgemaster
GX Hunter's Arms
Grand Divine Ire Obi
Rathalos Greaves X
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+5 Destroyer, +14 Fire Atk OO-
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2x Razor Jewel 3
1x Blaze Jewel 2
1x Spirit Jewel 2
2x Razor Jewel 1
Skills:
Honed Blade
Fire Attack +3
Challenger +2
Razor Sharp