When it will be used all dogs in some range will be teleported to its owner.

Inspiration:
Xun
Tsuchibue

Examples

Edit: sorry. Submitted my comment before I finished writing it.

I've started the changes for a whistle at my fork on the "feature/whistle" branch.

@DanTheColoradan Thank you for texture, but I prefer to use more common type of whistle. Unfortunately it is not obvious what is on those image(for most people)