A victory by the team seems 'within the realm of possibility'. [=a victory seems possible]
It's not 'beyond the realm of possibility' [=it's not impossible] that he will return.
new discoveries in the 'realm' of medicine
(..) All hail Bran the Broken, First of His Name, King of the Andals and the First Men, Lord of the Six Kingdoms and Protector of the Realm. All hail Bran the Broken! Lord Tyrion... you will be my Hand. N... No, Your Grace, (..)2019 TvShow: Game of Thrones Title: The Iron Throne Season: 8 Episode 6
(..) rulers will not be born. They will be chosen on this spot by the lords and ladies of Westeros... to serve the realm. I know you don't want it. I know you don't care about power. But I ask you now, if we choose you... (..)2019 TvShow: Game of Thrones Title: The Iron Throne Season: 8 Episode 6