If u only want to focus farming Harbingers, then do the Farm on the map Strand to be faster.
But i like having a tiny chance for an Apothecary or Seven years on Crimson Temple.
Why did i choose Exarch over Eater for this Farm?
Harbinger Shards aren't affected by Quantity. ( Means we don't have to target all the Quantity Altars from Eater )
Exarch Grand Eldritch Drops are currently extremly valuable.
POB:
https://pobb.in/c4oUXlfxxR-e