Board Thread:General Discussion/@comment-16083497-20130821092105/@comment-10259858-20130821093548

yes, you usually farm as many feeder as possible from 2-2-1 which only use 1 health every investigate and provide you all feeder without any sealstone

Just make sure you have enough silver to keep on going

another way is to get 4* magatama from event such as EG (which I don't know when it will start again), tower with trolling dora that you don't know when she will appear and what magatama she provides, soul gem that gives you variety of goods for completion reward... and lastly is conquest that you usually give the 3* daemon without good skill as a feeder to better daemon