Meko's Research

After "Witer's nightmares", just wait one day and then talk to Meko. The horn-y boy wants to find more about ghosts, 10 ectoplasms, easily obtained from ghosts, should be enough.

If you run low on MP, rest and farm more on the following night, once you have 10, give them to him, for a big 2000 EXP points boost.