▁Ath ena / M iner va . ▁In ▁The ▁Lost ▁Hero , ▁En cel ad us ▁is ▁killed ▁by ▁Jup iter ▁and ▁Jason ▁as ▁the ▁Gi ants ▁can ▁only ▁be ▁killed ▁by ▁a ▁god ▁and ▁a ▁hero ▁working ▁together . ▁In ▁The ▁House ▁of ▁H ades , ▁En cel ad us ▁re - ent ers ▁the ▁world ▁through ▁the ▁Do ors ▁of ▁Death . ▁ ▁E ph ial tes ▁and ▁Ot is ▁– ▁E ph ial tes ▁and ▁Ot is ▁are ▁tw in ▁ 1 2   ft . ▁G ig antes ▁that ▁look ▁somewhat ▁more ▁human ▁than ▁most ▁of ▁their ▁brothers ▁since ▁they ▁each ▁have ▁two ▁sn akes ▁for ▁legs ▁( which ▁they ▁usually ▁conce als ▁under ▁their ▁black ▁p ants ). ▁They ▁both ▁opp ose ▁D ion ys us / B ac chus . ▁E ph ial tes ▁and ▁Ot is ▁are ▁aw ak ened ▁in ▁The ▁Mark ▁of ▁Ath ena ▁by ▁G ae a . ▁E ph ial tes ▁and ▁Ot is ▁manage ▁to ▁capture ▁N ico ▁di ▁Ang elo ▁and ▁were ▁task ed ▁by ▁G ae a ▁to ▁kill ▁all ▁dem ig ods ▁of ▁prop he cy ▁but ▁two , ▁whom ▁they ▁are ▁to ▁bring ▁to ▁her . ▁They ▁fight ▁Jason ▁and ▁Per cy ▁who ▁defeat ▁them ▁with ▁the ▁help ▁of ▁Bac chus . ▁In ▁The ▁House ▁of ▁H ades , ▁E ph ial tes ▁and ▁Ot is ▁they ▁return ▁to ▁the ▁living ▁world ▁through ▁the ▁Do ors ▁of ▁Death . ▁ ▁Hi pp ol yt os ▁– ▁The