The Marcus NPC sells armor and misc items.
LOCATION
Marcus is located in the spawn section of every map (Kings, Elements, and Seasons).
SHOP
Marcus sells three categories of items (Beginner Armor, Armor, and Misc) and has an Upgrade Armor feature, allowing you to upgrade the Protection on your Diamond Armor.
BEGINNER ARMOR
Diamond Armor (Protection 1)
ARMOR
Gold Helmet
Diamond Armor (Protection 2)
Stylish Armor
MISC
7.75 Damage Sword
Moon Stick
Snow Pickaxe
Convenient Compass
UPGRADE ARMOR
Diamond Armor can be upgraded, increasing the Protection level.