Sharing your account with other players violates our Terms of Service. You are the only person who should have access to your account and you cannot share your account or transfer ownership to anyone else.
When several players are playing on the same account, it becomes impossible to return the account to the original owner and keep other players out. You also risk misuse of your account including spent currency or sold Monsters.
You accept full responsibility for the consequences of account sharing, and the Monster-Handlers reserve the right to terminate access to shared accounts permanently.