The best way to get this trophy, which is for killing 7 guards on rooftops in the Lady Persona, it is best not to use ranged weapons like the parasol or poison darts.
Instead, go to the Governor's house and aggro as many guards in the area as you can. Go round the back of the guard post and head up the staircase, following it round until you are up on the roof. Kill all the guards that have followed you, and, if it is not enough, head back down and lure some more up to their doom.
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