This is what I sent to Cust Serv:
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There is some confusion on what constitutes an object, when a wizard uses Force Orb to target an object. I hope you can answer some questions for me.
1. Can the entire planet the PC's are standing on be considered an object for purposes of targeting this spell?
2. Can walls or buildings be considered objects for purposes of targeting this spell?
3. Can any of the following be considered objects for purposes of targeting this spell: Wagons; Siege Engines; Boulders or Statues with a base greater than 5' by 5'
4. Can a 5' by 5' patch of ground be considered an object for purposes of targeting this spell?
5. If yes to question 4, does it make any game difference if an ally occupies that square?
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The Reply from Cody:
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An object is anything physical that is not a creature. Your DM probably wouldn't let you target the planet as a whole, but a single square of it, sure. Just follow the normal rules for targeting a square. If an ally occupies it, nothing changes. Allies don't grant cover to targets, and the spell specifies only enemies are targeted by the secondary attack.
Basically, it's up to your DM to determine what you can and can't target as an object.
Good gaming!
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I tried unsuccessfully to login to my Wizards account and ask more questions, like if 'adjacent' includes being inside of something. Although I suspect they would only give more DM's discretion advice.
Edit: Discovered I was mis-spelling my own wizards acoount password. Have sent another query regarding whether being inside a hollow object, means you are adjacent to it.