The start was tough, bumping into a wall or damage from a mummy or screamer would kill him instantly. Fighter and ninja levels were extremely hard to obtain but once he got his first priest level (through war crying), I was able to practice some spells and had him casting fireballs in no time. I didn't train him in the screamer or rat rooms, just played the game from start to finish.
The toughest monsters were those that could cast spells. As his anti-magic and anti-fire was extremely low (even at the end), most of their spells would kill him instantly. It was impossible to carry much equipment so I only really took the necessary.
I did have to use some unconventional methods (for me) such as closing doors on monsters and avoiding some of them. For example, I didn't even bother with the Stone Golems.
Well, there you go. It can be done



