A creature that requires a sword fight

[noob]

It could be a level 21 wizard lich who have infinite armies of ice assassins of gods(that he use only as a tool for destroying the world and is not anywhere close to it in normal time) and who thinks he would like to do a sword fight with a worthy opponent.
Then the lich says "I am going to send an army of ice assassins of gods if people do not fight me with a sword" of course if the lich is defeated in any other way the world gets destroyed(and then the lich will re-spawn and do the same thing in other worlds) and if someone beats the lich in a sword fight the lich go to another world and restarts.(but you saved one world at least)