▁McC aff rey . ▁ ▁K eres ▁– ▁Sp ir its ▁of ▁fam ine ▁and ▁disease ▁who ▁feed ▁on ▁violent ▁death s . ▁They ▁res ide ▁in ▁the ▁Under world ▁and ▁support ▁the ▁Tit ans ▁but ▁do ▁not ▁assist ▁them ▁in ▁The ▁Last ▁Olymp ian . ▁In ▁The ▁Dem ig od ▁Files ▁story ▁" Per cy ▁Jackson ▁and ▁the ▁S word ▁of ▁H ades ," ▁some ▁of ▁them ▁attacked ▁Per cy , ▁Th alia , ▁and ▁N ico . ▁One ▁of ▁them ▁poison ed ▁Per cy , ▁yet ▁" Bob ▁the ▁T itan " ▁managed ▁to ▁he al ▁him . ▁ ▁K ato ble ps ▁– ▁A ▁race ▁of ▁cow ▁mon sters ▁that ▁appear ▁in ▁The ▁House ▁of ▁H ades . ▁ ▁K et os ▁– ▁Ch ir on ▁mentions ▁this ▁giant ▁sea ▁mon ster ▁in ▁The ▁T itan ' s ▁Cur se . ▁ ▁Kh rom and ae ▁- ▁A ▁race ▁of ▁mon sters ▁with ▁sh ag gy ▁bl onde ▁fur , ▁gray ▁eyes , ▁sharp ▁teeth , ▁and ▁speak ▁in ▁high - p itch ed ▁sh rie ks . ▁D ion ys us ▁once ▁used ▁them ▁in ▁his ▁d run ken ▁invasion ▁on ▁India . ▁In ▁" The ▁T yr ant ' s ▁T omb ," ▁the ▁K rom and ae ▁were ▁used ▁during ▁the ▁Battle ▁of ▁San ▁Francisco ▁Bay ▁where ▁they ▁are ▁taken ▁out ▁by ▁Apol lo ▁and ▁Meg . ▁ ▁Lem ures ▁– ▁A ▁race ▁of ▁angry ▁g hosts ▁who ▁are ▁seen ▁on ▁multiple ▁times ▁in ▁The ▁House ▁of