Nothing important; what little you need to know about the original CoC to understand CoC2 is explained by either CoC2's intro or Kassyra, though there are still references to be found. The goblin cultist in the Foothills begins fights with almost the same line that the generic goblin enemy in CoC does ("(It's) Time to get fucked, slut!"), and at least two upcoming characters are spiritual successors to characters that appeared in CoC. On a meta level, Kinu (the most well-developed of the Champion of Hawkethorne's kids) was made partially to spite a portion of CoC's fanbase who wanted the option for the Champion of Ingnam to have sex with one of their more well-developed kids (specifically, their kid with Helia, commonly referred to as Helspawn).