What's the easiest/fastest way to get the ice chair?

Which monsters have the fastest drop rate for them?
I was at Jr. wraiths to get the original 50 which I got in about 10 minutes, but are there any places you guys reccomend?

The Mini Dungeon in Ant Tunnel 2 works wonders. You can pot and teleport~

mk thanks alot

A guildie said that the drum bunny one was really good also, ive never been to this one before, so i dont know the layout, but he said gen was able to hit almost the entire spawn.