ZenCraft is an RPG server with 10 different races and 10 different classes. This allows 100 different combinations of races and classes. You can have a simple Elf Mage who regens mana, runs fast, and shoots fireballs. Or you can get more creative and have a vampire elemental archer who shoots explosive arrows at people to regenerate health.
To protect your land, you will need a town. You can either join a pre-existing town or, create a town for $75,000. Once you create a town you can make money on taxes and plots.
You can mine any spawner and pick it up with a silk touch pickaxe, there are some hidden new mobs, you can bottle up your exp, you can even chop off someones head and sell it in the auction house for some loot.