Could anyone tell me where Magnus camps after being dismissed from the party? I must have searched the entire interweb trying to find out! Thanks!

He should be outside the shop in tarant where you 1st found him if he's not where you dismissed him - I made the mistake of not knowing the difference of "wait here" and "disbanding". The "wait here" means they won't go away/go to thier original locale, except after an extended period of time.