Shattered Kingdoms

Yes but with the whistle command is already being used in the game by the Hammer of Light. They use it to summon their spirit steeds.

Thread Necromancer I will smite thee!! could be pwhistle!! I like this idea, and should it be in place everyone's headache would get slightly better!

Yells go across kingdoms in the wild. Some kingdoms have loads of areas that are considered wild, so if you yell in the drow caves next to exile people in the white dragon caves way up north can hear you.

Echos!