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{{Spell
  | type = Incantations
  | name = Assassin's Guile
  | school = Illusion
  | subschool = Shadow
  | class1 = Swordmage
  | class1level = 6
  | time = 1 attack action
  | dur = Instantaneous
  | save = None
}}
''Letting the dagger of shadow roll between his fingers, the Swordmage smiled knowingly. He needn't bother with another attack, for the damage had already been done. All that remained was for his foes to recognize their wounds for what they were.''

This Incantation can only be activated on the same round as an Incantation with the [Teleport] descriptor, and only after at least one enemy has been successfully struck by one of those Incantations. All foes previously struck by an Incantation with the [Teleport] descriptor in this round takes Sneak Attack damage as if by a Rogue of the Swordmage's Caster Level. Whether or not they are flat-footed for this Incantation, or were flat-footed for the Incantations with the [Teleport] descriptor, has no bearing on whether or not they take this damage, though normal resistances or immunities to Sneak Attack damage do apply. No target can receive this damage more than once per round.