ENVELOPE + SCHOLAR + GENSHIN INSTRUMENTS
Mail by pigeon, proper books, and playable instruments.
Letters, packages, and pigeons to deliver them across the world. Diplomacy no longer requires both rulers to be online in the same place: write, seal, send.
A better book experience: two page editing and viewing, easy formatting, and colored books. Treaties, laws, and histories deserve better than vanilla books.
Playable instruments with full MIDI support: lyres, a zither, a drum, a horn. Taverns and feasts can have live music.