After level 40, it's simply impossible to kill Dwarves; they have a huge amount of defense and runes. With the right build, 20 Black Dragons can't kill a single level 1 Dwarf, but almost no one knows about this build...
Are you willing to bet on this with someone for money? (not including myself).
Maybe there's some very clever secret?
A simple calculation of the damage dealt by 20 Black Dragons shows that the above is impossible.
