In addition to the two abilities given by each surge, does a Knight Radiant order have a third blended ability, the interaction of its two given surges?
Not specifically as phrased there, but each order has quirks that are unique to it. They are magical quirks, but it’s not necessarily a blend of the powers.
So Shallan’s Memories is kind of a…
Is associated with her Order, yes.
It’s not just because she had that wonderful ability, and Pattern came along and went, “Oh, I like this one!”
No that is not necessarily what attracted Pattern.
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