User blog comment:Raymond1608/Melchio's OE Idea/@comment-33743339-20171123133608/@comment-30054866-20171123134750

I imagine that the above "All Element Parameter" boost pertains to an elemental specific tri-stat buff rather than standard tri-stat boosts (i.e. those from Shion). Think of the units of the bosses from the Third Arc (i.e. Divine Machine, Divine Wolf, Divine Phoenix, etc.), who all have elemental specific boosts. For example, the Divine Wolf has a water-type tri-stat boost, the Divine Phoenix has a tri-stat boost, and so on.

Keep in mind that this boost is usually not up there so 120% is actually just as good as the ones provided from the units that come from the 3rd Arc batch. Also, it stacks with classic tri-stat boosts and boosts relative to a certain stat.

Link to list of units within the 3rd Arc boss batch: here.

I hope this helped! (^^)/