How can you defeat the last boss?

[ZeroXGundam]

How can you defeat the last boss (i dont remember his name)?
three or four heads, throws up little spikey enemies

[z3r0-]

His name is Dark Falz. Form 1- you can meele hit it when it puts a head down to spit out the darvant things or just shoot the heads with a gun. Next form- chop at the heart till it dies.

[ZeroXGundam]

Im in level 26, HUmar, Weapons Knife + 4 and Buster +3, the stupid attacks he launches kill me even if i only attack, receive and then heal.