After playing again Musou Orochi Z and this time focusing to build my weapon into some super giga weapon (ie Tenbu, Feiryu) I have to look for the materials needed.
hence, I realized after I gathered the IMPOSSIBLE TREASURES
I can construct IMMORTALITY SWORD (upon death of character, one regains full bar of life)
Hourai Jewel, Fire rat robe, etc, all available.
KAGUYAAAAAAAAAAAAA