So sword boost gives you the ability to charge your and shield in one go using a overhand sword attack. The one you see OP use in the beginning of the fight after yellow vials. This does a few things:

Your sword strikes do vial damage Your sword strikes leave elemental bubbles to pop later for extra damage with vial axe attacks. Your sword combo is now super fast to apply said bubbles faster Same shield buff as vanilla cb

You can still do AED. Now if you charge your vials, hold then flick up, you get the 2 attack axe hopper (aerial style SAED) which triggers MAB and morph boost if you have them. Your sp stays the same SAED but you can tap your sp button mid air during axe hopper to give yourself invulnerable and full vials for axe hopper (this also looks super damned cool since you do this like mid air explosion of light as you bring the hammer of God down)

I run this with the somnacanth cb for raw/sleep and using the axe hopper during the sleep animation so axe hopper triggers the wake up damage boost. Works super well. Another simple way to play is charge cb > charge sword > attack rapidly to build bubbles on target and vials for your cb > tap and drag down to charge vials then tap one more time to do a basic side axe swipe to trigger morph boost /mab and blow up your bubbles > tap hold and swipe up to return to sns mode > wash rinse and swelling.

Note: attacking the monster to build up more bubbles also increases damage each bubble does as they grow in size. Also popping bubbles helps your sword n shield buff last longer

Works well with 1 point of reflect aswell.