Apologies for the double post, but I'm still developing my ridiculously high level party and am starting to experience some strange results which are probably related to the levels being higher than the programmers anticipated.
Once spellcasters go above level 160 or so, their Mind Jab and MindFist spells start to inflict more than 256 points of damage. This guarantees a kill as I have never spellbinded an enemy with more that 255 hitpoints. The anomaly is that the program (C64 tape version) must only use a single byte to report the amount of damaged performed, and so if you actually inflict 257 points of damage, the combat reports that you inflicted "2" points of damage. Sometimes I get the rather amusing "merlin casts a spell and fries enemy for 0 points of damage, killing him".
But that is nothing compared to what happened recently. My party contains two paladins. (I ditched my third paladin in favour of a monk who has the task of carrying the keys and the silver objects.) For a long time, these paladins have had 18 for all of their attributes, which I thought was the maximum value. However, recently, when levelling up these two paladins on two separate occasions, I was surprised to see the +1 text being output at the review board. Indeed, on viewing my characters, they both showed an previously impossible luck attribute value of 19!
Here are screenshots that I took:
I was worried that these luck values were going to be wrapped around to zero, making my paladins the unluckiest BT characters ever, but I have seen no evidence that this is the case - my paladins resist magic and traps just as well as before, and perhaps better than before.
I wonder if further leveling up is going to boost the other attributes to a previous thought impossible high?? BT is still exciting and mysterious after all this time!
Another weird effect that I am seeing is that the spellpoints of my three wizards increment by +1 in all dungeons, as if they were in the daylight of Skara Brea. This can even be combined with the mage staff for a rate of +2. Very cool, but totally mysterious.
EDIT ok, I have pinned that mysterious spellpoint incrementing to a bug in the game, nothing to do with my characters' extremely high levels.