Harry potter-"catacomb"

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Hi looking for a fic, it was Harry Potter x omc vampire named Iscariot, it had "catacomb" in the title I think, Iscariot and Harry battled the basilisk and Fawkes healed them both- Fawkes bonded to Iscariot as his familiar and Iscariot heart started beating again because of Fawkes tears, I think it started in Harry's first year and continued on from their, I read it many years ago and was hoping to read it again but I can't find it, does anyone have a copy or know where I can get a copy of the file to read it again, I really enjoyed reading it so much, please and ty :).