NEED GHOSTS?
Best - Outside Davon's Watch in Stonefalls
BahRaha's Gloom in Hew's Bane.
Wilding Ruin in Malabal Tor
Tanzelwil in Auridon.
Most Aylied Ruins.
Shael Ruins delve. Lots of glowy golden easy to kill ghosts. Was doing the Undaunted delve quest and hit 10 kills before I put the first spirit trap down.