We know the ED/dmg bug exists when this jewel is slotted in an armor slot (like helm). I've seen chatter that it works as expected if socketed into a weapon, but I haven't seen a clear consensus on shields (like Ars Dul'Mephistos).

Does anyone know?

The consensus is clear
It doesn't work

The bug occurs when the ED on the jewel is treated as "off-weapon" ED, which is the case for any non-weapon item.
Cheers.

did a quick test to re-confirm what people have said before, that the ED/min/max glitch doesn't glitch if an off-weapon item already had % ed before adding the jewel, because of the order of affixes
I don't know if the %ed on the jewel works or not, but the %ed on the base item clearly does work and isn't nullified by the jewel or else this barb's damage would be cut to ~1/6:




tldr: works if you socket it in ars meph, doesn't work if you socket it in items that don't already have %ed
/e and didn't show it in video but barb obviously hits for ~1/6 the damage when I took off the shield and attacked, the null case

This post was edited by Goomshill on Mar 20 2026 11:24am

it seems you might be incorrect - either way my thread is populated with the mixed consensus again heh. At least Goomshill's got a video showcase! Thank you for that.

Jury's still out on if the jewel's ED% is being added here or not

This post was edited by Lollaskates on Mar 20 2026 11:30am

Well i havent tested it myself but ive seen thread where people claim that their char is dealing less damage with the book socketed than with the book unsocketed

are you able to find that thread again?

also I did a quick test and showed: the % ed on the jewel itself is discarded and has no effect, both on displayed char screen damage and actual damage
its just the %ed on the shield itself that isn't being removed here
so if you socket a 115% ed ars meph with a 50% ed protector's stone, it will display 165% ed and +10-30 damage, but it will actually be 115% ed and +10-30 damage, and the char screen damage will still match what your char actually deals, only the item itself will display wrong

so once again %ed on protector's stone is a pretty irrelevant stat, because it ONLY works when socketed in a weapon


same test as above, just changed jewel to a 500% ed / 1-2 damage jewel. Shield displayed 1000% damage, but my attack damage was still ~450, and I was still dealing about the same % of enemy hp

This post was edited by Goomshill on Mar 20 2026 11:35am

Thank you so much goomshill for the definitive answer!

Yes, i saw that thread. But they were talking about the damage displayed in the character screen, and it would be pretty easy that it is simply lying again.