▁which ▁is ▁capable ▁of ▁un lock ing ▁any ▁door . ▁The ▁key ▁un lock s ▁a ▁storage ▁room ▁in ▁Con eria ▁Castle ▁which ▁holds ▁T NT . ▁N err ick , ▁one ▁of ▁the ▁d war ves ▁of ▁the ▁C ave ▁of ▁D war f / D war f ▁Village , ▁dest ro ys ▁a ▁small ▁is th mus ▁using ▁the ▁T NT , ▁connecting ▁the ▁Ald i ▁Sea ▁to ▁the ▁outside ▁world . ▁ ▁After ▁visit ing ▁the ▁near - ru ined ▁town ▁of ▁Mel mond , ▁the ▁Light ▁War riors ▁go ▁to ▁the ▁Earth ▁C ave ▁to ▁defeat ▁a ▁v amp ire ▁and ▁retrieve ▁the ▁Star ▁Ruby , ▁which ▁g ains ▁passage ▁to ▁S age ▁S add a ' s ▁cave . ▁With ▁S add a ' s ▁Rod , ▁the ▁War riors ▁vent ure ▁deeper ▁into ▁the ▁Earth ▁C ave ▁and ▁destroy ▁the ▁Earth ▁F i end , ▁L ich . ▁The ▁Light ▁War riors ▁then ▁obtain ▁a ▁can oe ▁and ▁enter ▁G urg u ▁Vol cano ▁and ▁defeat ▁the ▁Fire ▁F i end , ▁K ary . ▁The ▁Lev ist one ▁from ▁the ▁nearby ▁Ice ▁C ave ▁allows ▁them ▁to ▁raise ▁an ▁air ship ▁to ▁reach ▁the ▁northern ▁contin ents . ▁After ▁they ▁prove ▁their ▁courage ▁by ▁retr ieving ▁the ▁Rat ' s ▁T ail ▁from ▁the ▁Castle ▁of ▁Or de al , ▁the ▁King ▁of ▁the ▁Drag ons , ▁Bah am ut , ▁prom otes ▁each ▁Light ▁War rior . ▁A ▁kind ▁gesture ▁is ▁rep a id ▁by