▁upper ▁arm . ▁ ▁Cast or ▁– ▁A ▁son ▁of ▁D ion ys us ▁and ▁the ▁tw in ▁brother ▁of ▁Pol l ux ▁( both ▁of ▁whom ▁are ▁named ▁after ▁the ▁Gem ini ). ▁He ▁is ▁killed ▁in ▁The ▁Battle ▁of ▁the ▁Lab yr inth ▁when ▁he ▁was ▁st ab bed ▁by ▁a ▁dem ig od ▁al lied ▁with ▁K ron os . ▁ ▁Cec il ▁Mark ow itz ▁– ▁A ▁son ▁of ▁Herm es . ▁In ▁The ▁Blood ▁of ▁Olymp us , ▁he ▁is ▁a ▁part ▁of ▁the ▁team ▁sent ▁to ▁sab ot age ▁Camp ▁Jup iter ' s ▁on agers . ▁In ▁The ▁H idden ▁Oracle , ▁Cec il ▁is ▁the ▁first ▁to ▁kid n apped ▁by ▁N ero ▁and ▁stra pped ▁to ▁a ▁cru c if ix ▁to ▁be ▁sacrific ed ▁to ▁burn ▁the ▁Gro ve ▁of ▁D od ona , ▁although ▁Apol lo ▁and ▁Meg ▁manage ▁to ▁save ▁him . ▁ ▁Charles ▁ ▁– ▁A ▁son ▁of ▁He pha est us ▁and ▁the ▁head ▁coun sel or ▁of ▁the ▁He pha est us ▁cabin ▁before ▁he ▁died ▁and ▁was ▁replaced ▁by ▁J ake ▁Mason . ▁Like ▁his ▁father , ▁he ▁is ▁a ▁master ▁sm ith . ▁He ▁is ▁African ▁American . ▁He ▁was ▁in ▁a ▁relationship ▁with ▁Sil ena ▁Be a ure g ard , ▁a ▁daughter ▁of ▁A ph rod ite , ▁and ▁is ▁described ▁as ▁Mrs . ▁O ' Le ary ▁the ▁hell h ound ' s ▁best ▁friend ▁next ▁to ▁Per cy . ▁He ▁dies ▁during