Yeah I'm thinking that too since I used the peco hammer, which is fire element. Duramboros is weak to fire according to wiki.
Just fought a bunch of monsters, barioth was a complete joke. One thing I'm starting to hate is when you beat a monster, another quest pops up with the same monster. Examples being killing Royal Ludroth unlocks the capture Royal ludroth quest, and after Volcano Rathalos there's a D. Island Rathalos quest. I'm still gonna try to beat every quest as I go though.
It's good to have options though. Because besides just fighting the monster you can also gather stuff while you're there.
A what?
Maybe he meant the Azuros?