After some limited testing, gauntlet / reflection bosses deal less damage than they do on NG+2.
With 2 hardmodes active (charmless + demon bell), the Sword Saint's vertical shockwave attack (the one he uses after a deflected Ichimonji) dealt about 95-98% damage on NG+2 (i.e. reduced me to a sliver of health from full, and missing any health basically meant it's a oneshot), and about 85-92% in the reflection version (which is still very close to a oneshot, but sometimes healing items don't heal you to full and leave you with a very small amount missing - on NG+2 you'd need to heal one more time to be completely safe).

Not sure how many people know this but it's permanently unlocked after beating the game with any ending I think, second for bosses like inner father or genichiro you just have to make it to the end of the trial instead of having to go through the game 4+ times to unlock them

If it isn't affected by attack power upgrades, what is your attack power in gauntlets?

Definitely should have given a Rikimaru outfit for completing Mortal Journey.

Still rad to be able to fight every boss in a row, though.

Shout-out to Demon of Hatred for ruining half of these

the most difficult boss rush ever. Rewards: NONE LOOOOOL

awesome update

no genichiro outfit sadge

It's awesome how Fromsoft added the Inner bosses and gave us these bosses. They unlike their regular counterparts are a lot more difficult and have different movesets that players need to learn.

The Fandom page says that your attack power is set to a certain level in the gauntlets. Does anyone know what those levels are? And does anyone know if the bosses get a set value as well?