Have been thinking about the whole notion of time in this series;
1) The Paravians knew how to work with time - mention in GC or FP about Sethvir and Althain tower
2) Grimwards breaking down - cause laws of time to break down.
3) Mistwraith (wraiths) also appear to be able to work with time ( With Traithe at South Gate and future time)
4) Drakes know how work with laws of time -bringing F7 and not sure about stars seen in grimward
5)Paravians and their disappearance yet the strands reflect that they are in Athera.
There's a lot more but they were the ones that stand out with what's to come.