Enderal - Angel Quest (Throw and Explode the Barrel Through the Hole)
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Published on ● Video Link: https://www.youtube.com/watch?v=Q_xeyZRnXxA
Actually, it's not the barrel, it is the powder pouch she gives to you and you have it a bit lower in the same inventory submenu. However, I did use the barrel which works the same way.
Hope it helps...
Enjoy!