Quote Originally Posted by RakiReborn View Post
CON save makes it more balanced, but DC15 seems a bit low.
As a 3rd level berserker barbarian, you would probably have con16 for a total save bonus of +5. This makes a 55% save chance, which still might seem a bit high to me.
As a 20th level berserker barbarian with the capstone, you would probably have con24, for a total save bonus of +13. This makes a 90% chance to not gain the exhaustion. I would say that you should aim to a 50-50 chance at higher levels with con20 (+11 bonus), so a DC of 21, and you would have a 25% chance as a level 3 beserker this way. I did this the same way as a save for exhaustion on my Barbarian Punisher Path, as a replacement for the beserker in a campain i wll DM in the future.
I made it intentionally low. I honestly wasn't thinking Berserker when I initially gave them immunity to exhaustion. I gave them immunity to exhaustion because I thought it was something unique on their statblock, and I didn't want them to be a copy-paste of the aarakocra. Once you pointed out that immunity is definitely way too strong, I felt a low DC CON save was a happy medium. It's low enough that it'll be relatively easy to hit - even if a player is playing a wizard, but high enough that if they don't hit it, it's gonna suck.