1. Yes, the phantasm can move around with the target and take up its line of sight since it's in the target's mind. SAGE ADVICE2. The phantasm can act as you "pre-program" it to do so, including attacking the target (specific damage in the spell's description), but it's going to be based off of YOUR memories/imagination of what it's supposed to look or sound like. Only the target can perceive it, you can't change it after casting.
SAGE ADVICE
3. Your caster can't accurately make something if he/she has no idea what it could look like, like the starship Enterprise for example, or the target's mother whom you've never met before.
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