Bring Me To The Graveyard (Percico)

Percico/Pernico fanfic

Nico, Percy, Annabeth, Frank, Jason, Leo, Hazel, Piper and Reyna all set out on a quest to defeat an unknown demigod who set out to destroy Camp Half-Blood and Camp Jupiter.
PERCYxNICO, ANNABETHxREYNA, JASONxLEO ensue

Really only pernico though :)