What would you?

Well, if a weapon has 6 sockets, and its area is 8, you can only add 2 sockets to it.

Also, you can't make a runeword out of anything that's not a normal item. Remember Iths? Ever wonder why they didn't make a silence of the already silence weapon? It wouldn't work.

So, you can't make a BotD unique. (Otherwise, you could make a Kingslayer Rune Master.) Just doesn't work that way.