"Skoro syt aōha korze kostōba issa?"

Translation: Why is your long sword powerful?

[ArchNiki1]

Does that mean that syt means reason.
Which reason=why

[xPsGoDWh]

Not quite. "Syt" basically means "for" and it shows up in a later lesson as a post-positive when you say something like "I made this for you." Literally, "skoro syt" means "what for".