2 7 5 ). ▁H ag all ▁usually ▁tal ks ▁about ▁herself ▁in ▁third ▁person ▁and ▁her ▁powers ▁include ▁mental ▁control ▁and ▁hyp not ism . ▁She ▁is ▁a ▁very ▁self ish ▁and ▁am bit ious ▁demon ▁who ▁does ▁not ▁consider ▁the ▁ener get ic ▁balance ▁between ▁Heaven ▁and ▁Hell ▁( br ought ▁by ▁human ▁contract s ). ▁Later ▁it ▁was ▁revealed ▁her ▁coup ▁was ▁simply ▁a ▁r use ▁and ▁she ' s ▁always ▁been ▁loyal ▁to ▁H ild , ▁using ▁the ▁situation ▁to ▁show ▁her ▁an ▁ideal ▁world ▁for ▁dem ons . ▁ ▁Hal val ▁, ▁also ▁known ▁as ▁Hal val th , ▁is ▁a ▁powerful ▁demon ▁who ▁serves ▁H ag all ▁in ▁a ▁re bell ion ▁against ▁H ild . ▁Her ▁name ▁has ▁the ▁' r une ▁of ▁sound ' ▁" Þ " ▁( Th ur is az , ▁Th orn ▁or ▁Th urs ). ▁Her ▁main ▁power ▁is ▁an ▁ability ▁" to ▁see ▁sounds " ▁and ▁combat ▁in ▁complete ▁darkness . ▁She ▁batt led ▁against ▁Ke i ichi ▁and ▁Bel ld andy ▁in ▁episodes ▁ 2 5 1 ▁to ▁ 2 5 5 ▁of ▁the ▁m anga . ▁In ▁episode ▁ 2 5 5 , ▁Hal val ▁lost ▁the ▁fight ▁through ▁a ▁plan ▁of ▁Ke i ichi ▁Mor is ato : ▁he ▁was ▁influenced ▁by ▁the ▁kiss ▁of ▁Ch ib i - H ild ▁who ▁transferred ▁some ▁of ▁her ▁knowledge ▁to ▁him ▁before ▁she ▁went ▁back ▁to ▁N if l heim . ▁ ▁Th ry m r ▁, ▁also ▁known