i have additional question
Is there any heralds with higher drop rate than others?
For example act 4-5?
Or every herald in every act can drop sunder charm with the same rate
Heralds T4 and 5 have the TC dedicated to sunders
T1-2-3 can roll em but only thru the path of "Magic GC" turning into unique, then competing with Gheeds.
T4 and 5 also have this path but it is almost irrelevant compared to dedicated TC.
This is why people have been doing full game clears under shards.
The goal is to kill as many T5 heralds as possible, and since each Herald is T5 once you killed a T4, you dont have to "build up" anymore.
You can expect to spawn, on average, 16.9 heralds per game.