▁defeated , ▁Hel ios ▁goes ▁super n ova . ▁When ▁Apol lo ▁enc oun ters ▁Hel ios ▁in ▁the ▁burning ▁ma ze , ▁Apol lo ▁promises ▁to ▁free ▁him ▁from ▁M ede a ' s ▁control ▁in ▁exchange ▁that ▁he ▁lets ▁them ▁pass . ▁After ▁Pi per ▁k ills ▁M ede a ▁and ▁fre es ▁Hel ios ▁from ▁his ▁prison , ▁Apol lo ▁persu ades ▁Hel ios ▁to ▁hold ▁his ▁ra ge ▁and ▁finally ▁rest ▁while ▁planning ▁to ▁keep ▁his ▁mem ories ▁alive . ▁ ▁Hyper ion ▁– ▁T itan ▁of ▁the ▁East . ▁Hyper ion ▁is ▁the ▁father ▁of ▁Hel ios ▁and ▁Sel ene , ▁the ▁Tit ans ▁of ▁the ▁sun ▁and ▁moon , ▁respectively . ▁He ▁appears ▁in ▁The ▁Last ▁Olymp ian , ▁where ▁he ▁is ▁cl ad ▁in ▁full ▁golden ▁arm or ▁and ▁batt les ▁Per cy . ▁He ▁has ▁all ▁the ▁powers ▁of ▁the ▁Sun . ▁Gro ver ▁Under wood ▁tra ps ▁Hyper ion ▁by ▁turning ▁him ▁into ▁a ▁tree . ▁In ▁The ▁House ▁of ▁H ades , ▁Hyper ion ▁is ▁stopped ▁from ▁reform ing ▁in ▁T art arus ▁by ▁his ▁brother ▁I ap et us ▁( Bob ▁the ▁T itan ). ▁He ▁and ▁K rios ▁are ▁seen ▁later ▁guard ing ▁the ▁Do ors ▁of ▁Death . ▁Both ▁are ▁ob liter ated ▁by ▁the ▁physical ▁form ▁of ▁T art arus ▁as ▁a ▁show ▁of ▁power . ▁ ▁I ap et us / Bob ▁the ▁T itan ▁– ▁Lord ▁of ▁the ▁West . ▁First ▁seen ▁in ▁The ▁Dem ig od