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Message: <blockquote data-quote="RUMBLETiGER" data-source="post: 5580727" data-attributes="member: 6674868">If you want an official suggestion, Stronghold Builder's Guide has the Sailing property for making a stronghold buoyant.  It requires an individual with a caster level 11, Craft Wondrous Item, Water Walk spell, costs 3,000 gp per Stronghold space.  You'd also apply the locomotion speed.  Slowest speed is 1/4 a mile per day, at an additional 5000gp per Stronghold space, all the way to 10 miles and hour at the cost of 25,000gp per Stronghold space.the SBG suggests tying the control of the mobility to touching a specific object and using a command word, a specific room that you stand in and speak the command word, or a single creature who can utter the command word from anywhere within the stronghold.  You'd probably want the first or second option, unless you wanted a guardian construct or something to be the controller, and players need to use some diplomacy to get it to cooperate.  Now, here's the rub.  You're talking about an entire Island, not simply a castle.  A stronghold space is the equivalent of 4,000 cubic feet, or a 20'x20'x10' space (Expected to be an interior room)  You are taking this to epic levels.  If it doesn't matter to you how the island castle was constructed, you can just assume somebody spent a bazillion gold at some undetermined point in the past.</blockquote>