Back when I got my first lich in day1 patch, I let it steal my stuff for over 2 months of active gameplays. When I decided to kill it and take back my stuff my game froze for more than 10 seconds before the reward screen loads all the stuffs dropped by the lich. I almost thought the game crashed. And for your reference I got back like 2k Steel Essence, and 4pages of 4~7 figures resources.
It was fun.