The best part for me, is beating Dullahan in Hard (the HP does not change that much though, as it caps at 16,000) with no Djinns, and no summon rush.
I didn't even use default classes to reduce how will Djinn Storm fucks me, all I remember was letting guys die and not revive them until a Djinn Storm passed.
Haxing for 3x hits for Excalibur was also very helpful.