if you know how to.. hunt it on your own.. via bluefull or log 4 chars in (quad log requires 4 diffrent accounts), then make a room on ep 1 on Very Hard
then join with all your characters and talk to the quest lady: VR> Christmas Chatastrophe (Quest name)
you only need to finish it with 1 char (there are 4 "switches" you need to "activate")
after you finished the whole mines talk to the firs man again and spam enter (first selected item is HP Material)
do that with every other char too
youll get for each char 2 hp mats. so one run on quadlog (10-20mins) youll get 8 mats
then type: /lobby with all chars and do it again till you have enough mats c: