Here is the first draft of potential changes to the Assassin tree.
Core Abilities:
Assassin's Trick: This now works on all enemies and no longer has a saving throw. Targets now lose 25% Fortification and their Sneak Attack immunity.
Nimbleness: Nimbleness no longer requires sneak attacks and works on any hit.
Deadly Shadow: You gain +2 Dexterity and +2 Intelligence. You gain 10 Melee Power and +4 Sneak Attack dice. You gain +4 to Reflex saving throws.
Tier One
Poison Strikes: (Opponents struck by these attacks have an "Assassin's Mark" for 10 seconds.)
Shiv no longer reduces threat when you attack. It instead offers an additional passive component that reduces threat of all your attacks by 5/10/15%. The attack portion now also makes a Bluff check using your Bluff skill.
Stealthy: You also gain +20%/+35%/+50% movement while sneaking.
Tier Two
Venomed Blades: Now costs 1/1/1 AP. (As a reminder, Venomed Blades now scales with 200% Melee Power.)
Bleed Them Out: The bleed damage scales with 200% Melee Power.
Damage Boost: Cost reduced to 1 AP per level. Changed to boost Melee Power by 10/20/30.
Tier Three
Critical Accuracy is removed.
Critical Mastery: (1/1/1 AP) + 1/2/3 bonus to critical damage and to confirm critical hits
Tier Four
Critical Damage is removed.
Weakening Strikes: Your attacks against enemies with an Assassin's Mark (from Poisoned Strikes) reduce the Melee Power and Ranged Power of the opponent by 10 for 10 seconds.
Execute: Melee Assassinate attack: +3[W] damage. If target is below 30% health, deal 500 damage. This damage scales with 200% Melee Power. (Cooldown: 15 seconds)
Tier Five
Measure the Foe: Gain +4 Melee Power, +2 Dodge, +2 Maximum Dodge, +1 to hit and +1 to the DCs of your Assassinate ability for every 4/2/1 seconds you remain stealthed. This effect stacks up to 5 times and lasts for 10 seconds after you come out of stealth.
Deadly Strikes: Your attacks against enemies with an Assassin's Mark (from Poisoned Strikes) do +5 damage.
Light Armor Mastery: (1/1/1 AP) You gain 1/2/3 to Maximum Dodge. While wearing light armor you gain 2/4/6 to maximum dexterity bonus of your armor and gain 2/4/6 Physical Resistance Rating.
Sev~