Here's how that works:
Kikuichimonji
-Equipping the Kikuichimonji increases the wielder's Attack by 128 points.
-Asura may ignore half of the target's defense and tacks on another 64 points of damage.
Swift Blade
-Equipping the Swift Blade increases the Attack of itd wielder by 104 points and ups their Jupiter Power by 10.
-Sonic Smash does up to triple the damage of one standard attack.
Let's Put This Into Perspective
-Since Ivan is low-leveled, then even with the Swift Blade, one strike wouldn't do that much damage.
-Now, let's say you were HALF the level and could only do HALF the damage.
--If, in this scenario, the Swift Blade unleashed Sonic Smash and struck once, it'd do 50 damage.
--Now, I can take the Asura unleash's output and subtract 64 from it, since Asura adds 64 points of damage. That leaves 119. Cut it in half (since you can double the damage by ignoring half the defense) and you get 60 for the base damage. Now, we don't need to half that; we just don't double it. Add 64 and we get a damage output of 124...and more frequently than our 150. See how close they're getting...and these are just approximations.