Anyone know what this fic is? 8th year fic thats quite dark.

Hello all,

Could you help me identify this fic? I stopped midway through and forgot the title. It was an 8th year fic. Draco was sacrificing deatheaters in rituals to harvest dark magic into his body. I think Blaise and Theo were helping him as well. I got to the part where Hermione finds out.

Thank you