▁Ch oz o ▁race ▁and ▁civil ization ▁are ▁unknown , ▁but ▁they ▁were ▁once ▁spread ▁across ▁several ▁plan ets ▁in ▁the ▁Met roid ▁universe . ▁L ore ▁entries ▁in ▁Met roid ▁Prime ▁suggest ▁that ▁the ▁race ▁may ▁have ▁tra ve led ▁to ▁a ▁higher ▁plane ▁of ▁being ▁as ▁opposed ▁to ▁dying ▁out . ▁The ▁Ch oz o ▁were ▁extremely ▁advanced ▁in ▁technology , ▁some ▁say ▁they ▁could ▁not ▁be ▁more ▁advanced , ▁but ▁the ▁ch oz o ▁took ▁pride ▁in ▁their ▁elaborate ▁stat u ary . ▁They ▁also ▁ex changed ▁knowledge ▁with ▁other ▁species , ▁including ▁the ▁L umin oth ▁of ▁A ether , ▁the ▁Re pt il icus ▁of ▁Bry yo , ▁and ▁the ▁E ly si ans ▁of ▁E ly s ia ▁( rob ots ▁which ▁the ▁Ch oz o ▁themselves ▁built ). ▁L ore ▁found ▁in ▁Met roid ▁Prime ▁ 3 ▁specifically ▁mentions ▁a ▁fellow ship ▁of ▁en light ened ▁species ▁that ▁once ▁existed ▁between ▁the ▁Ch oz o , ▁the ▁L umin oth , ▁the ▁Re pt il icus , ▁and ▁another ▁race ▁called ▁the ▁Y lla . ▁While ▁the ▁former ▁three ▁have ▁been ▁exp ounded ▁on ▁in ▁the ▁series , ▁the ▁Y lla ▁are ▁only ▁mentioned ▁in ▁this ▁piece ▁of ▁l ore ▁and ▁have ▁yet ▁to ▁be ▁seen . ▁The ▁Ch oz o ▁were ▁also ▁responsible ▁for ▁the ▁creation ▁and ▁bre eding ▁of ▁Met roid s . ▁While ▁in ▁the ▁Japanese ▁versions ▁of ▁the ▁games , ▁the ▁be ings ▁are ▁only ▁ever ▁identified ▁by ▁the ▁generic ▁term ▁,