Really? I am just getting into the assassin and I thought twin fangs would be a must ... no damage hitting in the front. So which do you advise spinning blades or deathblow. At the moment I have it set up as Stealth, Twin Fangs, Hidden Blades, Shadowstrike.
Zan the Man has a Plan
Don't get me wrong, TF does an incredible amount of dmg, especially out of stealth, but since its hitbox is so unpredictable, I don't trust it as much as the other two.
Spinning Blades does with its upgrade 900 weapon dmg, the last two hits will knockdown the enemy and with "looked like it hurt" and "sneak attack" you instantly got all your stamina back, even without killing the target. Deathblow on the other hand is by far the best finisher in the game, dealing at least 900% weapon dmg (if you use it exactly at 50% enemy health, even more if the target has less health, DON'T use it above 50%) and doesn't have any cooldown if you kill your target with it, which is its best part. You really can go on a killing spree with DB, if you stab your enemy 1-2 times with your auto attack and finishing him off with DB. DB is even a small aoe attack, hitting everything within half meter or so in front of you.
I usually go with: Spinning Blades, Hidden Blades, Deathblow, Stealth.
And btw. spinning blades grants an high amount of guard, if you have Savage Thorn or another "guard on hit" dagger equipped. ^^