Utterly Mad

I'd say tuning a single HEM to two frequencies would perhaps be a little OP, seeing as they're essentially Gods by human standards even with a single frequency, unless a HEM unit with two frequencies was a little less effective at either of them? Combining HEM units through physical contact sounds real interesting though, since then you're limited by maintaining physical contact with another character, would there be any repercussions if the link was broken though?