The Blacksmith job is based around using McMMO Anvil (Iron Block) as well as repair gems to fix items. As well as smelting ores.
Smelt Iron and Gold, Repair Armor, Tools, and Weapons
None
Repair, Salvage, Smelting
Level 10 - 10% McMMO xp boost in repair.
Level 50 - Armor enchant bonus.
Level 80 - Weapons Enchant Bonus.
Level 100 - Title: Forged
N/A
The Crusher is tied to the Blacksmith job. You can visit the Crusher at spawn, but once you unlock the Blizzard rank, you can access /crusher on your island.