[FOCI]

Cypher System Rulebook 1e
You're an assassin, whether by trade, by inclination, or because it was that or be killed yourself.
Someone who Murders might have additional equipment, including three doses of a level 2 blade poison that inflicts a moderate wound (5 points).
If attacking from a hidden vantage, with surprise, or before your opponent has acted, you get an asset on the attack. On a successful hit, you inflict 2 additional points of damage.
You are trained in stealth and disguise tasks.
You know how to kill quickly. When you hit with a melee or ranged attack, you deal 4 additional points of damage. You can't make this attack in two consecutive rounds.
You are trained in interactions involving lies or trickery.
You become hyperaware of your surroundings in order to better locate your target. For ten minutes, you are aware of all living things within long range (including their general position), and by concentrating (another action), you can attempt to learn the general health and power level of any one of them. or
You are trained in crafting, sensing, identifying, and resisting poisons. Your poison crafting has given you some immunity to poisons; you have +5 Armor that applies specifically to poison damage.
If attacking from a hidden vantage, with surprise, or before an opponent has acted, you get an asset on the attack (if you have Surprise Attack, this is in addition to the asset from that ability). On a successful hit with this surprise attack, you inflict 2 additional points of damage (for a total of 4 additional points of damage if you have Surprise Attack).
You inflict an additional 3 points of damage with your chosen weapon.
When you kill a foe, you can attempt a stealth task to immediately hide from anyone around, assuming that a suitable hiding place is nearby. or
With a swift and sudden attack, you strike a foe in a vital spot. If the target is level 4 or lower, it is killed outright. For each additional level of Effort you apply, you can increase the level of the target by 1.
GM Intrusions: Most people do not react well to a professional killer.