▁H ades . ▁ ▁Le uc ro ta e ▁- ▁Cre atures ▁that ▁had ▁the ▁body ▁of ▁a ▁red - fur red ▁l ion ▁and ▁the ▁ho ov es ▁and ▁tail ▁of ▁a ▁horse ▁and ▁can ' t ▁be ▁har med ▁by ▁metal ▁weapons . ▁In ▁The ▁Dem ig od ▁Di aries ▁story ▁" The ▁Di ary ▁of ▁Luke ▁Cast ellan ," ▁Luke ▁and ▁Th alia ▁were ▁tra pped ▁in ▁Hal cy on ▁Green ' s ▁m ansion ▁and ▁encountered ▁by ▁two ▁Le uc ro ta e ▁that ▁speak ▁with ▁a ▁man ' s ▁voice . ▁The ▁two ▁of ▁them ▁discovered ▁that ▁the ▁Le uc ro ta e ▁are ▁linked ▁to ▁Hal cy on ' s ▁thoughts . ▁When ▁Th alia ▁uses ▁fire ▁on ▁the ▁Le uc ro ta e , ▁Hal cy on ▁sacrific es ▁his ▁life ▁by ▁l uring ▁the ▁Le uc ro ta e ▁away ▁so ▁that ▁Luke ▁and ▁Th alia ▁can ▁escape . ▁ ▁Le vi athan ▁– ▁These ▁are ▁mentioned ▁by ▁P ose id on ▁in ▁The ▁Last ▁Olymp ian ▁as ▁giant ▁sea ▁cre atures ▁that ▁are ▁neutral ▁in ▁the ▁war ▁between ▁P ose id on ▁and ▁Ocean us . ▁ ▁L up a ▁– ▁The ▁w olf ▁that ▁raised ▁Rom ulus ▁and ▁Rem us . ▁She ▁gu ides ▁the ▁children ▁of ▁Roman ▁gods ▁to ▁Camp ▁Jup iter ▁after ▁they ▁are ▁left ▁for ▁her ▁at ▁the ▁Wolf ▁House ▁where ▁she ▁trains ▁them ▁to ▁become ▁Roman ▁soldiers ▁upon ▁finding ▁the ▁worthy ▁ones . ▁She ▁is ▁the ▁Roman ▁counter part