Okay, so at first I thought that the wiki was just inaccurate about the amount of explosions on the charges of these swords, since my Acheron only releases 0-2 explosions, but then my friend showed me his three brandish swords, they all dealt 2-3 explosions.
P.S My Acheron is at lvl.10 and was crafted after the binding patch if that matters.
So whats that all about?
I have an Acheron, it does 1-3 explosions. Usually 2 though, rarely does it hit 3. The number really is random, do a lot and see what you get.
Some things will block the explosions like the edges of the elevator platform, so be sure the path is clear.