At-Will
Always: You gain a +5 bonus to all disengage checks you attempt this turn. You can also move to engage an enemy, make this attack against it, and then use a quick action to attempt to disengage from it (the quick action disengage lets you move again if you succeed).
Attack: Dexterity + Level vs. AC
Hit: WEAPON + Dexterity damage.
Miss: Damage equal to your level.
Rolls
Melee Attack - Total - (1d20+8)
(8) + 8 = 16
Abandon Dagger - Total - (2d8+5+2d6)
(15) + (54) + 5 = 20
Sneak Attack - Total - (1d6)
(5) = 5
Disengage if needed - (1d20+5)
(13) + 5 = 18