[quote=@Noxious]
What is going to bring all the characters together?
[/quote]

The campaign will open with the characters being hired as mercenaries by a demon lord for a mission. That's all I want to reveal right now.

[quote=@Noxious]
As an Old One it seems like you'd be playing by yourself since no one else can talk to you.
[/quote]

Many Old Ones learn the demonic speech in order to be able to communicate with other inhabitants of Hell.