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Can I put a Hero in Kereth Ravine and take it back out in the same prep phase?
Why not? You are allowed to put characters in Fortresses during your prep. You are allowed to take characters out of your fortresses during your prep. Why not do both?
Except the the default for removing cards is to do it in prep phase Nice try though.
Side note: Why would you need to wait a turn to have a Persian Presidents target? They can capture any hero that's in set-aside as well can't they?
Cards are placed in a fortress during the Preparation Phase, unless specified otherwise (e.g., Storehouse or Banishment).
You don't need an ability on a Fortress to be able to add/remove a card if the Fortress ability doesn't give any requirements for adding/removing cards. The default game rule is that you can add/remove cards from a Fortress during the prep phase. If this isn't true, then all those Forts from RoA don't work (Stronghold in the Dessert, House in Bethany, Musician's Chambers, TGT , etc.).
So I can use Musicians' Chambers as a Storehouse for musical enhancements? I didn't realize that I could pick up an enhancement from Musicians' Chambers and add it to my hand.
Except the the default for removing cards is to do it in prep phase
Play As: You may place one O.T human Hero from your territory or set-aside here and/or return a Hero here to where it came from. Protect Heroes here from harm.Attribute: Play to set-aside area