Gear is important in any MMO, and Zenith: The Last City is no different. While players explore the world and complete quests, they will come across various monsters. Your skill and gear will be what keeps you alive, so you will want to get good gear and upgrade it.
To upgrade your gear in Zenith: The Last City, you will need to find an Enhancement Station. There is one by the exit to the city. Here, you can select the gear you want to upgrade and view the cost for both Yen and Essence Dust. Then, if you have enough of both materials, simply pull the lever to upgrade the gear.
Related: How to join and complete public events in Zenith: The Last City
Where to get Essence Dust
Essence Dust will be much harder to come by than Yen. However, as Essence Dust is essential to upgrade your gear, you will need to get a lot of it. Typically you can get this resource by opening chests and breaking down the gear you don't need. Breaking down gear not only provides Essence Dust but also clears out your inventory.
Gear alters all of your attributes, so you should be equipping your best gear and upgrading when you are able to. Having good gear can be the difference between life and death in Zenith MMO.
For more information on Zenith: The Last City, check out How to open chests in Zenith: The Last City and Where to find the three Lucky Pandowls in the Fractured Plains in Zenith: The Last City? on Pro Game Guides.