This specialization is obtainable through the quest Way of the Assassin, obtained from Heir. After acquiring the following, Heir will teach the Inquisitor the specialization.
Writing on assassin methods (available from either Cole or the book merchant in Val Royeaux).
3 assassin guild leader tokens.
20 deathroot.
Knife materials.
Talents
Hidden Blades
Activated
65 stamina
Cooldown: 32 seconds
Damage: 300% weapons damage per hit
Number of Hits: 3
They'll swear you leapt from the shadows like the thrown blade and hit your target with a flurry of strikes from every angle... but its obvious that you were nowhere near them at the time.
Overkill
Upgrades Hidden Blades
Cooldown Reduction: 4 seconds
Additional Hits: 3
You use Hidden Blades faster and more easily, launching even more strikes on your victim.
I Was Never Here
Passive
Unlocks 3 Dexterity
Requires: Hidden Blades
You have learned to use the distraction of an enemy's death to slip silently into the shadows. Killing a target removes any cooldown on Stealth.
Knife in the Shadows
Passive
Unlocks 3 Dexterity
Requires: I Was Never Here
You are a deadly threat to any enemy that can't see you coming. When you attack from stealth, you automatically critical hit.
Throatcutter
Passive
Damage Bonus: +2% damage for every 10% missing health
Unlocks 3 Dexterity
A wounded enemy is the perfect target. Your attacks are even deadlier against targets that are close to death already.
Knockout Bomb
Activated
35 stamina
Duration: 10 seconds
Cooldown Time: 20 seconds
Requires: Throatcutter
You hurl a grenade containing a powerful concoction that put nearby enemies to sleep. Sleeping enemies awaken after taking damage.
Comatose
Upgrades Knockout Bomb
Enemies affected by Knockout Bomb sleep more deeply, allowing your allies to hit them even harder with flanking damage.
Gaps in the Armor
Passive
Armor Penetration: 25%
Unlocks 3 Dexterity
Requires: Knockout Bomb
Your attacks slip past armor to find a target's hidden vulnerabilities.
Mark of Death
Activated
10 stamina
Cooldown: 32 seconds
Duration: 8 seconds
Stored Damage: 100%
Requires: Knife in the Shadows
Requires: Games in the Armor
You mark your enemy, and every hit adds part of its power to the mark's damage. Trigger your mark when you are ready, and watch your enemy fall from injuries that were never even noticed. You can manually trigger the mark early fro bonus damage.
Mark of Doom
Upgrades Mark of Death
Armor Reduction: 20%
While it is active, Mark of Death leaves the target vulnerable to even more injury.
Cloak of the Shadows
Focus Ability
Tier 1 Duration: 3 seconds
Tier 2 Duration: 6 seconds
Tier 3 Duration: 9 seconds
You go into stealth, and your allies follow your lead. The entire party remains undetected for the duration of the effect, even while attacking. This ability consumes and is powered by Focus.