Metal_Visceral
Everyone prays to something. Tommy's family prays to the Blood God.
He grew up learning that blood is an offering, not just a wound. In the Soot family, it's normal to see what others can't, it's normal to be touched by something supernatural, and it's normal, sometimes, to go mad because of it. Tommy is the youngest, and he's always been the sane son, until the hallucinations started. Grotesque creatures lurking at the edges of his vision, some still, some not, all seeming to know his name. He learned to live with it.
But returning broken from exile to an empty house is different. No Phil. No Techno. Just a silence that shouldn't exist, and monsters getting worse by the day. Tommy needs to find his family, and to do that, he will do whatever is necessary. The prophecies say that the Blood God will soon awaken. And that he will want blood.
Or
Tommy returns from exile to an empty house. Between hallucinations that might be lying to him or warning him, he needs to find the rest of his family before he loses his mind completely.
Or
Whenever I see the idea that Tommy grew up raised by Phil, with Techno and Wilbur, in a good family, some details don't add up. So here's my own version of the post-exile arc, with an extra dose of horror.