I have 2000 echos completed and started recording data for about 800 echos. My data is for 200 to 400 corruption. Its not nearly enough data, but it helps.
A target unique (TU) has about a 5% chance to appear. It can vary depending on how I complete the web and use vessels. For example, 10+ distance away has the best odds. Also, if a timeline can have 2 different types of TUs, such as wands or staffs, then its a 5% chance each.
Vessels had about a 1% chance each to appear in a given web. This is not the best data because its not based on distance. I think you need to push deep in the web before they start to appear and you can get more than 1 if you explore most of the web.
I did not notice a big change from 200 to 400, but again lack of data.
As to how I feel… I feel like targeting uniques is okay. I would hope for slightly better odds with higher corruption and I hope that is the case. Even though there is only a 1 in 20 chance for my TU to appear, I can use vessels to make farming more efficient and avoid completing many echos with rewards that I do not want.
For example, I can achieve a 30% efficiency rate where I earn 3 TU out of every 10 echos I clear. That is only after significant investment in the web. If the rate were decreased, I think it would lead to exhaustion. I still feel excited when I see my TU appear.
For investing in a web and exploring 300 echos (maybe completing half of that), it feels good having about 3 vessels of chaos and 3 vessels of memory. That chance feels okay.
I did not collect data on sets or exalted, but from my feelings… I think set chance is a bit too high. But I think when sets are improved, then I won’t mind.
I think exalted chance is a bit too low. I hardly see the exalted item I am targeting. This may be okay too, because I like that I can go to the dungeons to farm exalteds more efficiently.
I expect this all to change with trade and rates may need adjusting then.
2 more things:
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If something was changed, I would like to see it in the patch notes. Some players spend time figuring out efficient farming strategies. EHG should respect the player’s time and avoid silent changes.
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This may mess up balance, but I think it would be fun if I could also use a Beacon to path from, when I reset the web with a vessel of memory.
EDIT - I don’t think EHG should give us specific numbers, but just general statements like shrines are more common now. Or, the chance for rare echo rewards were tweaked depending on corruption. I don’t know that is the case, but if so, a brief mention would be nice.