I'm not really sure what information level 52 was based on. It may have come from the original spell data file from Kunark, but maybe that file contained beta levels that never went live.
Here's an old bug report about it:
https://www.project1999.com/forums/s...ad.php?t=34660
I couldn't find any reference to the level increasing right after Kunark launch, so I'll increase it to level 54 until evidence is found.