If you do "Slay the Mighty Dragon" quest, make sure you immediately do the "build anything" cheat and "now you die" cheat on the dragons. if you dont do this, you will be utterly destroyed in less than a minute. use "revelation" to find the "dwarven settlement" and get the magic sword as fast as you can.
The very last quest available. you must complete every other quest first. "Day of Reckoning" is the hardest quest ever. every two seconds, you must use "restoration" and recruit as many heroes as you can in order to win. the very first cheat you must use is "revelation" to get all the temples and elves and dwarves. after you get the dwarves, you can build the ballista towers to help repel the evil creatures.