It makes alot of sense to play it offline =o
You can try builds, or bots anything without consequences.
Also being a GM can be fun too ;p
But besides that.. Just download eathena and set up a lan server.
yeah but, alone xd.
It's like cheating on GTA/whatever, it's funny 3mn and it's all.
And there is no point to bot on an empty server xd.