I found it.
We need to drop or cast the teleport spell on the barrel to teleport the protagonist to the barrel while it is teleported to the protagonist's place, switching places. Sometimes, I found this magic in early dungeons, even in the first one. But I'm not sure what it's called because I was playing in Japanese. I'm just going through all the available magic in my inventory randomly. ^_^'''
PS In early two dungeons we can found this spell with very high chances, because there's not so much other spells.
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