The other set of ten types of magic was mentioned as Voidbringing wasn't it? Or was it to do with the old magic?
I would love to see more of that (Voidbringing)
Voidbinding, actually. There are voidbringers, no one knows who they are, but possibly, they voidbind
I am not sure this has confirmed to be the "other" 10 sets of powers, but it seems fitting to many.
Interesting thing about Elhokar's "truth"-spren? What if these are actually driving him to become a voidbringer (some people think there's the opposite to the 10 Radiant orders, and these are the voidbringers, so "evil radiants" for lack of a better term). So Elhokar could be "rejecting truth" - he is extremely paranoid - and thus become a bad guy, his glory-focus being a diversion. That means that fulfilling an ideal can make you a radiant, or rejecting an ideal makes you the corresponding voidbringer. It's all a bit too "good v. evil" and Brandon's stories are usually more complex than that, though.