Quick plot idea that came to my mind pretty much randomly
Some Entity that is against solas tempus (i.e Onyx) sends agents into past to disrupt events by killing one of characters, which basically would wipe everything they done.
So Temporal operatives team would have to prevent that
Saying killed character would be Megan
She intervened when Vlad was planing to fire at Grtul gate/civililans which could spark a war if it would happen.
There are issues though
First of all character would have to be actually picked carefully, because killing in example Lance would end with ST not becoming a thing
Second, we’d have to check what character actually done and assume what would happen otherwise which can take some time.