Ambu's Charge gain up to maximum endurance charges bugged?

Hi, I was playing around with Screams of the Desiccated belt with Diamond shrine buff and came up with an idea to utilize Ambu's Charge. If I understand correctly, all hits are critical strike, meaning that even a secondary damage from e.g. trauma will crit me and should proc the endurance charges gain, right? I tested this and it doesn't work unfortunately. On the other hand, the runegraft for life recoup from crits seems to work just fine. Is this a bug or I am missing something?

From my understanding, self-crit via trauma requires sources of self-crit. You don't crit yourself just because you have 100% crit chance. Assassin's Mark or Brittle to add base crit, Reckless Defense for % crit, etc.

Without base self crit, only mobs critting you should be able to proc the Runegraft or Ambu's. Neither of your Mirage characters have Ambu's or the belt, so I'm assuming this is on another account or something. My first guess is you have other recoup sources so self damage via Trauma is proccing normal recoup (doesn't care if it's a crit or not) and not the Runegraft recoup.

Hi, thanks for the answer. Regarding my characters, I am theorycrafting the build before going all in so I just swap items on my current gladiator to test interactions.

If your statement is correct, equipping Call of the Void and Secret of suffering should solve the issue? I need to test it. I thought "your hits always crit" doesn't need any base crit chance.

Self damage is part of a bucket separate from the player, so should be unaffected by Diamond Shrine which is why Brittle, etc is needed to give it crit chance.

This might word stuff better than I can.

https://www.poewiki.net/wiki/Self-damage

The first mechanic point of not using offensive stats is important not only cause it shouldn't be affected by Diamond Shrine, but also because scaling the self damage with your other stats like % damage would also be very bad.

Sounds reasonable. Totally missed that in the wiki and focused only on the "crit possible" part when I read it :)

So, there are only two ways, self Assassin Mark (no idea how to do it), and self brittle - only through Fulcrum? I tested the secret of suffering + call of the Void approach and it didn't work. I also tried Hatred sublime vision and Galesight, same story. Ehhh... I guess my Fire Discharge spammer needs to wait for some new tech.

Thanks all for the answers!

Yea, I can't think of any way to reliably apply marks to yourself. There's a few gimmicks like exarch altar, but nothing consistent that I can find. Stuff like Skitterbot ring, Blasphemy ring, and Shackles only work with Hexes, not Marks.

Same with Brittle, can't think of any reflect sources other than Fulcrum. Shame we don't have the weapon swap tech from PoE 2, but there's a dumb angle to manually swap to Fulcrum with a 6L duration/ailment boosted Brittle skill, pop that to reflect a maximum 6% brittle on yourself, then swap back to your Discharge weapon for the next however many seconds you can realistically get that up. And as long as you're not dealing any other ailments while Fulcrum swapped, you don't need any ailment immunities if you're only doing cold to apply Brittle.

But even with 6% base self-crit, every 200% Reckless Defense would only add another 12% crit. Meaning you'd need a total of 8 jewels to 100% crit yourself? At least if the block rolls are decent you'd have that going for you. Guess there are other angles where you maybe only go to 33% but hit yourself more often. But low rolling will feel bad.