[LordArioch]

I'm pretty sure the old ice devil is one of the 6. Also I can see a limit on ID + blood search revision resulting in the ID and other blood summons being largely divided between mictlan and abysia, with some other nations claiming a lesser share. Also...what happens if you try summoning a ID and they're all taken?
I'd give this some time and let a competive game pass to see how the blood balance works out...but I can see how the decreased money could make blood even more powerful.