My Essence Farming strategy. I've made over 150 divines, including getting 3 Hyrri's Ire drops, a Kalandra Ring, Hinakora Lock, etc all from this strategy.
Set up atlas tree as follows - might not be most efficient, but I'm not that good at efficiency. Note the Harby nodes are lowest priority. However, they are more mobs every map, many affected by wisps, and I've gotten 2 fractured shards out of them with them just being there so.
Then follow this (Cheapest Method, Assumed 5 map device)
1. Use a 20% quality, rare (and optionally corrupted) T3 Strand map with a Rusted Torment Scarab, Rusted Ambush Scarab, Rusted Elder Scarab, and a fragment piece.
2. Buy some Remnant of Corruptions
3. Use Essence Map device (This is only available if you get the 7th gate passive like I do on above tree).
4. Load into map
5. DO WISPS - This is most important. Try to kill everything, and collect in order of priority: 1. Quant (Yellow), 2. Currency (Blue), 3. Rarity (Purple)
6. After wisps, start clearing map as normal. If you collect a ton of wisps, it should rain currency.
7. Try to avoid killing tormented spirits until they touch a lot of mobs, or possess rares or even better possess the essence.
8. If you see an essence with 2 shrieking and 1 screaming, use a remnant on it if you can to hope for upgrades to deafening with 1 shrieking (as the shrieking will dupe them when they release). There's a specific RGB strategy on this, but I think that doesnt apply as much since Insanity/Delerium/Horror essences are not really expensive this league.
(This essence drop set alone is worth over 40c)
9. When you get to boss room if theres lots of tormented spirits let them possess the boss or as many as you can handle. Then kill it.
This is the results from a map with 1200 currency, 1500 quant, and 400 rarity wisps, which is in the upper 50% of maps, but quite typical. Also had a jewellers orb explosion:
Occasionally, you'll get giant juicy explosions like the above Jewellers orb, or 2,000+ Orb of Fusings I posted earlier or sometimes very juicy scarab explosions:
EDIT:
IMPORTANT: Sell your essences as DEAFENING only, and ONLY do divine trades. You get a lot more bang for your buck.
