Not gonna lie, I cried. When she started singing the song all I could think was "Oh no, Kiara, why would you choose this? There's no way you'll be able to sing this without breaking down"
^The last time I saw that symbol on this artist’s work was when they sketched an Iname Call of Cthulu au. So it’s likely that’s the Elder sign from the game. It’s supposed to ward off/protect from the Great Old Ones, in this case I guess it’s for Ao-chan.