Mastersmith is the pinnacle of the Blacksmith's career. The Mastersmith is able to create valuable items from any material they can get hold of. Plus, they have achieved the zenith of craftsmanship and can now upgrade weapons more efficiently. The Mastersmith also specializes in manipulating fire and using various weapons in battle.
The Mastersmith skill base grows upon the Blacksmith's Axe/Mace skills and received a lot of nice new skills. Although the class almost seems to be ignored by Gravity, or almost lowered in power compared to the other Reborn classes, Smiths still pose a dangerous threat to almost every class. They have the power to break Weapons and Armor while they're attacking their enemy with Shattering Strike (Meltdown) and then unleash a flurry of High Speed Cart Rams (Cart Termination). This class takes a lot of customization in order to make work properly and takes a lot of time and effort to play one well.
Being a class with high damage per second rating, Mastersmiths gained boosts in their skills that exploit their ASPD. One is the Shattering Strike skill that perpetuates use for their skill Weapon Repair due to the chance of it breaking a target's weapon or armor. Another noteworthy skill, HSCR(although over shadowed by their co-class' Acid Bomb as their new skill) is known to make characters with low VIT run for their lives. HSCR is another skill that benefits from ASPD.
Another note is that the Mastersmiths with their new skills drains more zeny than their non-rebirth counterpart.
To become a Whitesmith, you must find a book called 'the Book of Ymir' in 'Sage Castle', Juno. The book will lead you to Valhalla so you can change your job through the Whitesmith job NPC. Also you must reach at least job level 40 as a transcendent 1st class character.
