Board Thread:Questions and Answers/@comment-39483612-20200410144908/@comment-46281113-20200707103715

GER doesn't erase reality, it returns everything to the state of 0. This means that in theory, GER could just return to the state when Heaven's Door hadn't written anything yet, and Heaven's Door couldn't do anything against it. However I wonder if Heaven's Door can write something like "GER cannot affect me or my stand" on Rohan, which would perhaps prevent GER from returning to 0, but then again does returning to 0 really count as directly affecting Rohan/Heaven's Door ?

Edit : There's also the fact that when Rohan turns people into books, they become incapacitated, hence Heaven's Door could hypothetically make Giorno just forget about him acquiring GER in the first place by ripping off the pages containing his memories. The only problem with this is that GER is self-aware, so he could potentially reset Rohan's actions before he can do anything to Giorno.