[MHW:I] Alatreon Gunlance Solo but it's High Rank Cartless (The Evening Star HR Gear Only 21'05"08)

Gunlance is an elemental weapon.
Fun challenge, probably will try to get it better next time. Probably the worst thing about this however is that wyvernstake scales off not only raw but your shelling level. Since we're using a significantly worse shelling level than the Master Rank gunlances I do a staggering third/fourth of my regular damage on my best attack, and Gunlance isn't exactly the best at meeting elemental check either making this challenge pretty rough for the weapon.
Mods used (speedrun legal):
Daily food skills utility (guaranteed food skills) - www.nexusmods....
Fexty's mod (Palico is guaranteed to play Attack song at first use) - www.nexusmods....