Comandos: 

/title @a title {text:"CAPITULO",color:red,extra:[{text:" 1",color:gold}]}

/title @a subtitle {text:"El nuevo",color:green,extra:[{text:" mundo",color:green}]}

Scoreboard de las Kills: /testfor @a[score_Kills_min=1,score_Kills=1] 

Con lineas debajo :  /title @a title {text:"+5 ",color:green,extra:[{text:"xp",color:gold,"underlined":"true"}]}

Corazones: /title @a title {text:"❤❤❤❤❤❤❤❤❤❤",color:red,extra:[{text:"",color:gold,"underlined":"true"}]}
/title @a title {text:"❤❤❤❤❤❤",color:red,extra:[{text:"❤❤❤❤",color:black}]}

Simples: /title @a title {text:" 3",color:gold}