I don't have any special technique, I just spam all kind of exori spells and heal using exura ico, of course I also have Ultimate health potions with me but I don't even get to use them since I easily heal of using exura ico, only if 2 or more Grim Reapers attack me at the same time I use the UHP's, and don't forget about not facing them "forward" so they cant attack you with their strongest spell.
Thanks for the help
Excelent life thread