The world of Terraria is a fantastical world full of mystical lands, like the Hallow: A colorful land that looks like it came out of a fairytale; blue grass, multicolored trees... and very aggressive unicorns & pixies, at day.

At night, you are roaming around the strange land, looking for anything of interest. Then, you notice a shiny, prismatic butterfly, flying around...

Suddenly, a flash appears around it! And in it's place...

Empress of Light: yawn, stretches Ugh...