This is a copy of the Assassin enhancements on Llama... they are pretty rough in some spots and obviously not finalized.
Granted
Knife in the Darkness (0 AP, Rog 0)
You gain proficiency with Kukris. You can also use your Dexterity modifier to hit with Daggers and Kukris.
Dagger in the Back (5 AP, Rog 3)
You can now use your DEX modifier for damage with Daggers and Kukris
Assassin's Trick (10 AP, Rog 6)
Activate: Target intelligent opponent loses 25% Fort and immunity to Sneak Attack for 12 seconds if the target fails a Will save (DC 10 + Rogue Level + Int Modifier)
Nimbleness (20 AP, Rog 12)
On Sneak Attack: Up to once every 2 seconds, you gain 1% dodge for 6 seconds. This effect can stack up to 10 times.
Lethality (30 AP, Rog 18)
Any sneak attack that also counts as a vorpal strike that you make will kill most living targets.
Deadly Shadow (41 AP, Rog 20)
+4 Sneak Attack Dice
Tier 1
Poison Strikes
Select one of three Poisonous attacks.
Toxin Affinity (3 Ranks)
+1/2/3 Fortitude Saves vs Poisons (and?) to the save DC of your Poison attacks
Shiv (3 Ranks)
Melee Attack: Deals +1/2/3[W] damage and reduces your threat with nearby enemies by 100. On Sneak Attack: Target also gains a -2 Fortitude penalty against Poisons for 20 seconds. (Stacks 5 times.)
Sneak Attack Training 1
Grants +1 Sneak Attack die and +1 to hit when performing Sneak Attacks
Stealthy (3 Ranks)
+1/2/3 Hide and Move Silently
Tier 2
Poison Strikes*
Venomed Blades (3 Ranks)
Poison Stance: On Hit: 1d4/6/8 Poison damage with weapon attacks
Bleed Them Out (3 Ranks)
Melee Attack: Deals +1/2/3[W] damage and on successful damage causes your opponent to bleed. The bleed effect can stack up to 5 times.
Sneak Attack Training 2 (Requires: Sneak Attack Training 1)
Grants +1 Sneak Attack die and +1 to hit when performing Sneak Attacks
Damage Boost (3 Ranks)
Tier 3
Poison Strikes*
Critical Accuracy (3 Ranks)
+1/2/3 to confirm Critical Hits
Shadow Dagger (3 Ranks)
Throws a dagger made of solidified shadows at your enemy. Deals 4d8 unholy damage and blinds the target (Fort DC 10 + Half Rogue Level + Intelligence Modifier negates Blindness)
Sneak Attack Training 3 (Requires: Sneak Attack Training 2)
Grants +1 Sneak Attack die and +1 to hit when performing Sneak Attacks
Stat Enhancement: DEX or INT
Tier 4
Execute (Requires: Critical Damage)
Melee Assassinate Attack: Deals +3[W] damage. On Sneak Attack: If the target is below 20% health, deal 500 damage (Fort DC 10 + Half Rogue Level + Int Mod negates).
Critical Damage (3 Ranks) (Requires: Critical Accuracy)
+1/2/3 Critical Hit damage (before weapon multipliers)
Killer (3 Ranks) (Requires: Critical Damage)
When you kill a target, you gain a 5% Morale bonus to melee doublestrike for 15 seconds. Weak enemies will not always produce this effect. The killer buff can stack up to 2/3/4 times.
Sneak Attack Training 4 (Requires: Sneak Attack Training 3)
Grants +1 Sneak Attack die and +1 to hit when performing Sneak Attacks
Stat Enhancement: DEX or INT
Tier 5
Assassinate
Stealth Melee Assassinate Attack: On Sneak Attack: Kills a living target instantly if the target fails a Fortitude save (DC 10 + Rogue Level + Int Mod). Even on a successful save, the target takes 10d6 additional Sneak Attack damage from this attack.
Improved Assassinate (3 Ranks)
+1/2/3 to the save DC's of your Assassinate abilities.
Knife Specialization
+1 Critical Threat Multiplier with Daggers and Kukris. Daggers also gain +1 Critical Threat Range.
*Poison Strikes
Figuring the poisons might be based on the ones we have now I did a search in the localization for the descriptions... near as I can tell these are the ones it refers to.
Heartseeker Poison
Melee Poison Attack: On Damage: -1 Fortitude Save (stacks 5 times), On Critical Hit: 1d6 Constitution damage, On Vorpal Hit: Heartseeker (-5% hit points Fortitude DC 10 + Half Rogue Level + Intelligence Modifier negates)
Soulshatter Poison
Melee Poison Attack: On Damage: -1 Will Save (stacks 5 times), On Critical Hit: 1d6 Wisdom damage, On Vorpal Hit: Shattermantle (-100 Spell Resistance for 10 seconds Will DC 10 + Half Rogue Level + Intelligence Modifier negates)
Ice Chill Poison
Melee Poison Attack: On Damage: -1 Reflex Save (stacks 5 times), On Critical Hit: 1d6 Dexterity damage, On Vorpal Hit: Paralysis (Fort DC 10 + Half Rogue Level + Intelligence Modifier negates, 30% chance for an additional save on damage)