Cid Sophiar: Master Mechanic
This quest becomes available after the end of Chapter 1. During the battles at the end of chapter 1 Noctis will pick up a Drain Lance. If you take it to Cid he will offer to upgrade it for, as well as any weapon that has a yellow + sign on it.
He will ask for a metal scrap. If you don’t already have one, you can find them lying around (there is one in the Hammerhead parking lot as well as one on the boardwalk in Galdin Quay). Return to Cid and he will begin the upgrades. When he’s finished you’ll receive your Drain Lance back as well as 500 EXP.