A: The first Vincent weapon you get is the peacemaker, which is in kalm village.
Q: If you choose to open the big chest after trading in the key item mithril, what will you get instead of great gospel?
Regarding my last question, Apocalypse is the second best weapon for maximizing ap. It has 3 slots and triple growth, so slots * growth is 9. The answer I was looking for was javelin, one of Cid's weapons with double growth and 5 materia slots.
