Board Thread:General Discussion/@comment-26344910-20150714004740/@comment-26293010-20150827000139

Think of it like this:

It has to combine a sword, whip, and gaunlets (or whatver Ruby and Sapphire weapons are).

So it also has to combine a bow, a hammer, and a flail/mace (whatever you see it as).

(View this for all weapons of fusions with 3 and more gems)