[PS5 Pro][Eternal Rogue] Massive Damage Bug After Joining a Party – Damage Drops from Trillions to Billions

I’m playing Diablo IV on PlayStation 5 Pro. My character is a Rogue on the Eternal Realm.

I’ve found a serious bug that happens after joining another player’s party.

When I’m playing solo, I test my damage in The Training Grounds, and my damage reaches multiple trillions, which is the expected value for my build.

However, after I join a party, even if I test on the same training dummy, my damage drops dramatically to around 100 billion at most. Nothing about my gear, Paragon, skills, or build has changed. Only joining a party triggers the issue.

Sometimes closing the game completely and restarting fixes it, but this is random. In about 90% of cases, restarting does not solve the problem.

The same issue also happens in The Pit (Tier 125).

When the bug occurs:

  • Enemies barely take damage.

  • Sometimes dying once temporarily fixes it, but most of the time it does not.

  • Under normal conditions, I can reach the Pit boss in less than 5 minutes out of the 14-minute timer.

  • When the bug is active, I can still reach the boss, but the boss’s health eventually stops decreasing completely. No matter how long I attack, the HP bar stays almost frozen until the timer expires.

This appears to be a severe damage calculation or multiplayer synchronization bug that only occurs after joining a party.

Platform: PlayStation 5 Pro
Realm: Eternal
Class: Rogue