Instanced dungeons through the ages: raid Greece, Egypt, Rome, the Aztec empire, the age of dinosaurs and the Norse afterlife with your friends — no world clutter, no grief, just echoes of the past.
Remember when Minecraft had real oceans? Until 1.6.4, the world was big continents floating in a huge ocean. Since 1.7.2, it's an infinite landmass with elongated lakes.
A simple mod that adds an experience bar similar to the ones used in Pokémon games. It also includes Combat Log improvements related to experience and leveling.