Something you probably already know - apart from dark knights that lose a limb stating "it's just a flesh wound", if you manage to chop off at least 1 leg and his sword arm (i think) he'll say "I'll do you for that! I'll bite your legs off!", again Monthy Python and the Holy Grail.
I always carried the lantern in my left hand... untill I accidentally didn't equip it and noticed that it's still a light source when it's in your inventory.
Make it an IVANcube level. Every room has a 75% chance to have a landmine/bear trap/banana peel/broken bottle on a random square. If it is in Atomic, put a Mad German Scientist behind a glass wall in one corner of the level. Bonus points if his notepad reads everything you did on this level so far - "Test subject broke trough wall"
If you are currently, say, Cruentus' little bitch, but you want to improve Int/Wis, does it hurt your relationship a lot when reading books of good gods?