Slayer sucks for charms.

 

CT waterfiends or barraging are the only worthwhile methods for gathering charms.

which is why I said "It's not necessarily good charms"

 

My point was, there's really no need to power train it when you could just do something profitable like Slayer, and get the same end result. It would also be a lot more fun then sitting at one monster for every day.

 

All the Charms I've gotten for Summoning were from Slayer, so it seems to work well for me.