I'm starting to think this is just a tML64 issue. I did a test run with it, it crashed, but no error showed. The game simply closed. And the client.log file had nothing useful.I found this now with tmodloader 64. Last it just closes the game. Yes its serris. Just checking
Then I tested Serris in tML64 again, and this time I was able to beat it crash free. I have no clue what's going on. I don't think this is something I can fix.