> Now they are 52 and I'm afraid?

Levels don't mean the same thing after 51. A new immortal doesn't simply advance a level past the end of mortal, they become an enormously more powerful being imbued with divine power. It's a huge transformation, not just another incremental step. That's why the level is now "AVA" and not 52. Yes, in a file on a piece of electronic hardware in reality they are level 52. IC they are something else entirely.