Proxy
Cultist
Asking isn't bad, is it?You may as well ask why every person has X in their signature.
As for it leading to the Calamity Mod, that's either his way of showing support for it or the link is a leftover thing from a previous version of his signature that he accidentally didn't erase.
aww, Anticlimactic Answer, but an Answer.I have no idea why... I copied it from someone's profile pic xD