The forum thread explains it in detail:

http://www.adom.de/forums/showthread...this-will-have

"Yes, it is definately a buffer overflow problem since it writes the last bytes of the name over the race pointer which comes immediately after the name. I had tried using several different characters as the final character but could only get Human. If your final character is a space, ADOM simply drops it and treats your name as one character shorter. I had tried to input lower non-printing values and even some Unicode characters but those also seemed to get dropped from the name and had no effect."