The echo is approved as stated, with him only echoing the ability for use on himself right now.
If you ever want him to figure out how to affect other souls with it, you'll need to ask the other players before using it on their characters, but there's no reason why he shouldn't figure that out, too.
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If you ever want him to figure out how to affect other souls with it, you'll need to ask the other players before using it on their characters, but there's no reason why he shouldn't figure that out, too.