Oda

i can't seem to figure out how to get the drop "Heavenly Melody Guitar" from Skleros Trial. Ran it so many times already. The google sheets wiki said that it drops from "Torreyace's Chest" but the only chest I get is "Dragon's Secret Chest" when I defeat the 3rd or maybe the last boss which are the twins. Tried bard but no drop and I checked the drop list from the chest already but I don't see the guitar in the list. Need help