Working Together-Infiltrated the Cetra, worked with Sephiroth
A mechinization of doom-It was called the calamity
4 tutonic beasts of war- it has 4 forms, birth, life, death and synthesis
Head on aint no option- Jenova didn't have it's head on it's body
At the base of a memory- Jenova changed it's shape to accord with peoples memories
Of startling aptness- Jenova destroyed the Cetra by impersonating their dead relatives
I block your way yet reward your passage-you have to fight her often, but once you beat it, you get ifrit, wizard braclet reflect ring, and to beat sephiroth
Is it Jenova?