So, I've been using the Heliosphere Emblem (the solar one) and I noticed something.
While it may work great with earlier-game weapons, pretty much anything you obtain beyond the point when you can actually make this thing actually have their damage decreased, and so will any weapons if you have enough damage boosting accessories. At this point, I have a pre-Golem sword that is stronger without the Emblem, and while I get why it is at the point in the game that it is, it just doesn't really feel worth it unless you're using exclusively low or mid-tier weapons. And most of those aren't as fun as the later ones.
I have only tested the warrior one so far.