Omega-level mutant Elixir must come to terms with his anti-mutant upbringing as he battles vampiric mermen in this intense adventure from Marvel's School of X.

Joshua Foley once hated mutants, then he became one. It's... problematic. When his healing powers became apparent, the violent anti-Mutant Reavers rejected him and only the X-Men provided sanctuary. Now he is surrounded by mutants who still see him as their enemy.

During a deep-sea training mission, he is suddenly attacked. A cult of sea monster-worshipping vampire mermen lay siege to the base, leaving them stranded and trapped. As the attacks escalate, their chances of survival decrease. Things go from terrible to even worse when someone from the team starts sabotaging their attempts to call for help, all in the name of a sleeping behemoth who will soon awaken...