At 1st level, the Assassin can make a special sneak attack called a Death Attack. This ability adds to the Rogue's Sneak Attack ability, adding an extra 1d6 points of damage. This bonus rises to +2d6 at 3rd level, +3d6 at 5th level, +4d6 at 7th level, and +5d6 at 9th level. If used against an opponent not already in combat, a successful death attack forces the victim to make a fortitude save or become paralyzed.
The DC for a target to become paralyzed is equal to; 10 + Assassin Level + INT modifier.
Note: Death Attack does not count as a sneak attack to qualify for the Arcane Trickster class.