After the events of "The Blade is Me", Ichigo's Zanpakut is now two blades; a smaller knife with an enclosed grip that corresponds to "Old Man Zangetsu" his Quincy powers, and a larger blade ...

So I wish for strength. If I cannot protect them from the wheel, then give me a strong blade, and enough strength... to ...

According to his description, Ichigo’s Final Getsugatensho form can risk it all in a single destructive blow. It is the end of a Substitute Soul Reaper, now turned into a blade.