Does know someone, how upgrades Drakkon's Zerth Blade to Drakkon's Stream Blade (DSB) 2? DSB2 to DSB3? DSB3 to DSB4? DSB4 to DSB5?

And where are, or how will i become Ring of Holiness II, and/or RIng of Wizardry II?

Your Daakon's Blade is upgraded together with your level, i.e. once your character advances certain level, if the Blade is equipped, he/she receives a new Blade instead of the previous one.

P.S. As regards levels of advancement, please see the description of the Blade.

Only with PC?

Because Kachiko wield DZB, Kachiko grows up to lvl 15, and nothing happens, and with in another game with my Bard I became DSB2 at lvl 10-12