From the official site:
Journey through a vast, seamless world. Explore crumbling ruins and uncover the history of ancient civilizations. Fend off hunger, thirst, and even insanity as you explore dark dungeons filled with monstrous creatures. Escape scouring sandstorms and bloodthirsty cannibals. Gain knowledge to craft new items and build stronger structures. Unleash your savage fury with brutal attacks that will see heads rolling and limbs flying.
Harvest anything from rocks and wood to rare minerals and human flesh. Use forges, workbenches, tanneries, and more to craft tools, armor, and powerful weapons. Construct a home, a fortress, or an entire city using the incredibly powerful building system. Build on almost everything, from ancient ruins to towering mountainsides. Craft a wide variety of furniture and decorations to customize your home and settlement.
Wage war on enemy players, blow up their city walls, and take control of the Exiled Lands. Capture thralls, break them on the Wheel of Pain, and put them to defend your settlement and craft rare items. Build an altar to your god and bring them offerings to earn their blessing and rewards. Summon and take control of towering avatars, and see your enemies driven before you as you crush their homes and their legacy.