▁two ▁units ▁touch , ▁a ▁cl ash ▁begins , ▁and ▁the ▁two ▁units ▁attack ▁one ▁another ▁in ▁the ▁style ▁of ▁Fire ▁Em blem ▁batt les ; ▁after ▁the ▁player ' s ▁unit ▁attacks , ▁he ▁or ▁she ▁will ▁be ▁prompt ed ▁to ▁begin ▁a ▁Un ison . ▁When ▁a ▁Un ison ▁begins , ▁a ▁circle ▁of ▁effect ▁called ▁an ▁Imp act ▁Circle ▁appears , ▁and ▁every ▁other ▁al lied ▁character ▁on ▁the ▁field ▁will ▁be ▁assigned ▁a ▁number ; ▁by ▁entering ▁the ▁numbers ▁of ▁any ▁al lies ▁within ▁the ▁Imp act ▁Circle , ▁those ▁units ▁will ▁join ▁in ▁the ▁attack ▁and ▁do ▁even ▁more ▁damage . ▁Any ▁unit ▁whose ▁H P ▁is ▁reduced ▁to ▁zero ▁retre ats ; ▁if ▁the ▁player ▁continues ▁a ▁Union ▁Att ack ▁after ▁the ▁enemy ' s ▁H P ▁hits ▁zero , ▁they ▁start ▁dealing ▁fatal ▁damage . ▁If ▁the ▁H P ▁bar ▁reaches ▁zero ▁twice , ▁this ▁is ▁considered ▁a ▁Kill ▁Out . ▁Un ison ▁Att acks ▁can ▁only ▁be ▁used ▁by ▁players . ▁ ▁Sometimes ▁characters ▁with ▁a ▁connection ▁to ▁each ▁other ▁will ▁con verse ▁with ▁each ▁other ▁before ▁a ▁cl ash ▁actually ▁begins , ▁or ▁after ▁it ▁con cludes . ▁In ▁the ▁D S ▁version , ▁this ▁is ▁displayed ▁on ▁the ▁top ▁screen . ▁These ▁are ▁known ▁as ▁D uel ▁Events , ▁and ▁the ▁dialog ue ▁changes ▁based ▁on ▁who ▁is ▁attack ing ▁whom ▁and ▁whether ▁the ▁cl ash ▁ends ▁in ▁victory , ▁defeat , ▁or ▁death . ▁ ▁The ▁unit ▁types ▁from ▁Y gg dra