Sure. As far I understood it, that if you get a "token" (ire) which will trigger an herald it is only for the current session. Then you have 5 Tiers for the heralds. The first herald that appear is tier 2, then tier 2 etc. now I have for like two hours always a tier 5 herald. In other words, if I leave the game I have to start from tier 1.
ok makes sense, I didn't know that it doesn't transfer to the next game. That's tedious and afaik not all zones can get a herald right?