▁The ▁Last ▁Olymp ian , ▁where ▁he ▁is ▁seen ▁fighting ▁alongside ▁his ▁brothers ▁and ▁sister s ▁of ▁the ▁Apol lo ▁Cab in . ▁He ▁serves ▁as ▁a ▁major ▁character ▁in ▁The ▁H idden ▁Oracle , ▁where ▁his ▁and ▁Kay la ' s ▁ab du ctions ▁in ▁the ▁woods ▁by ▁N ero ▁prompt ▁Apol lo ▁to ▁rescue ▁them . ▁Austin ' s ▁inherited ▁tal ents ▁are ▁primarily ▁musical . ▁ ▁Bian ca ▁di ▁Ang elo ▁– ▁A ▁twelve - year - old ▁daughter ▁of ▁H ades ▁and ▁the ▁older ▁sister ▁of ▁N ico ▁di ▁Ang elo . ▁Per cy , ▁An nab eth , ▁Gro ver , ▁and ▁Th alia ▁rescue ▁her ▁and ▁N ico ▁along ▁with ▁the ▁help ▁of ▁the ▁Hun ters ▁of ▁Ar tem is ▁from ▁West over ▁Hall ▁and ▁the ▁m antic ore ▁Dr . ▁Th orn . ▁She ▁becomes ▁a ▁Hunter ▁of ▁Ar tem is , ▁whom ▁she ▁attempts ▁to ▁rescue ▁in ▁The ▁T itan ' s ▁Cur se , ▁alongside ▁Per cy ▁Jackson , ▁Gro ver ▁Under wood , ▁Th alia ▁Grace , ▁and ▁Zo ë ▁Night sh ade . ▁She ▁sacrific es ▁herself ▁to ▁save ▁the ▁group ▁from ▁a ▁mechanical ▁prototype ▁of ▁Tal os . ▁For ▁a ▁while , ▁this ▁causes ▁N ico ▁to ▁be ▁mad ▁at ▁Per cy ▁but ▁N ico ▁has ▁a ▁secret ▁cr ush ▁on ▁Per cy ▁which ▁is ▁mentioned ▁in ▁the ▁House ▁of ▁H ades ▁when ▁Jason ▁and ▁N ico ▁meet ▁Cup id . ▁N ico ▁tries ▁to ▁sum mon ▁Bian ca ▁from ▁the