i know its quite a old game but i alreadyh vae it for some years now -_-" never got further then trodain XD but anyway can any1 tell me where Morrie's monster arena is ?

Hmm been quite a while since I've played DQ8 now.

Well when you're on your way to Picham, you see a weird guy standing on top of a building at your left.

Talk to him, and he want you to slay three special enemies.

1: A knight sorta thing, can be found near Angelo's home town.
2: A kid squid. Found south from picham at the beach
3: Just a slime. Found at the entrance to Trodain I think (Don't remember)

Anyway, after you've found the enemies, head back to Morri, and he'll let you in to the monster arena :)