I have a Rogue that just reached level 3 and got to pick an Archetype. I picked Assassin.
Now I’m trying to figure out how to roll against a target I sneak up on and surprise.
Here is the situation: Rogue Assassin sneaks up on unsuspecting target double wielding 2 short swords (2d6) and attacks. To me this seems like it grants Sneak Attack (2d6 at level 3) and Assassinate (automatic critical) since the target is surprised.
So damage would be as such:
2 * (2d6 + 2d6) or 8d6
(Plus Dex)
Is this correct or am I missing something?
Best Answer
You are correct. You deal 8d6 + ability mod damage if both attacks hit
Let's go through how we get there:
On a crit, you double all of the dice you would have rolled, including sneak attack, then add the relevant modifier
This is clearly defined in the basic rules (page 75), and in the PHB under the section for critical hits (emphasis mine):
So, your shortsword attack with sneak attack would normally be 1d6 (shortsword) + 2d6 (sneak attack) or 3d6 damage. On a critical hit you double the number of dice: so (2*3)d6 = 6d6 plus the relevant ability modifier.
Attacking with an off hand shortsword is a separate attack, but can still crit
Assuming that your off hand attack hits, it would be a crit (the creature is still surprised, so the assassinate feature still applies). It deals (2*1)d6 or 2d6 damage. You don't add any non-negative modifiers to off-hand attacks. You also don't reapply sneak attack, since that feature can only be used once per turn.
Putting that together, you get 6d6 + ability modifier + 2d6 = 8d6 + ability modifier damage.