Laughing Arachnids is a Halo Custom Edition gaming server ran by the creator of Aren Chronicles. The series used to be called "Last Arena" and when we would play online we would have [LA] in our names a clan tag. When anyone would ask what it meant it was we'd tell them it stood for "Laughing Arachnids".
The Halo Custom Edition Server is ran on the patch for 1.0.10 which is the last patch the game received.
Instructions are within the folder. You'll need to extract the the zip folder and from their the instructions are what worked for me.