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Do you need proficiency longsword to wield the force sword (as in the spell)? Thanks in Advance!
Yes you do. A spell which gives you proficiency would be phrased like the instant weapon spell instead.
No, you don't need proficiency to wield it.
However, if you don't have proficiency you will take a -4 penalty to your attack rolls, like you would for lacking proficiency in any other weapon.