What is Shadow Meso?

But why would it matter, seeing as triple throw completely overpowers it in 4th job. Also, even if it was worth using in third job, it would really kill your mesos....Wait, even then it won't matter because with shadow partner, it only hits twice vs lucky 7 hitting 4 times

First of all, it hits hard.

Second of all, number of hits has nothing whatsoever to do with how much DPS a class can do. In this specific example, sure, L7 > SM, but it has some potential in my opinion.