Darigan is a made up place in a game called Neopets. It's a world where there are a bunch of different creatures and people with different powers and personalities. It's kind of like a pretend world that you can go and explore and play games in. But it's also a place where people can be good or bad and fight against each other.
In the game, there is a character named Lord Darigan who used to be good but then turned evil and started taking over the world. He was stopped by a group of heroes, but his bad energy stayed in the land and made it kind of dark and spooky. So now, when people talk about "darigan," they usually are referring to that spooky feeling or to the creatures and characters that live in that part of the game world. Some people even like to pretend they are part of the darigan world and dress up as their favorite darigan character when they play the game. So really, darigan is just a place and a feeling in a pretend game that people like to explore and have fun in!