This game is wild.
Hero's Potion was bought from Hope, the Enfire Potion from Canopus Farms vendor, the three garbs from Canopus Farms and Jadg Village vendors (5000, 5000 and 1250 gil), Imperil was dropped by Desert Sahagins (15% drop rate), Shard Blade was dropped by Apandas (10% drop rate after a Perfect Block Stagger while biped; 0% drop rate otherwise), Fighter's Emblem was obtained in Luxerion from a Treasure Sphere.
Timestamps
0:00 Fight
2:02 Smite
2:17 Build