Remember the episode in St. Olga's when they were in the room of Demon paintings and moon ground? Foreshadowing
Crescents appearing together with a star or stars are a common feature of Sumerian iconography, the crescent usually being associated with the moon god Sin (Nanna, Queen Moon) and the star with Ishtar (Inanna, i.e. Venus, Star Butterfly), often placed alongside the sun disk of Shamash god of law
So with this and demons in the room above Star vs lore gets interesting. Not to mention when the moon and star are turned left it gives the Star meaning of Satan. We didn't see which side they were standing on in episode though.
Also in the picture Star has worn one of the symbols on the far left as a necklace. Also small note is King Butterfly wields a Star and Crescent scepter.
Ending with more on blood moon>The idea of a "blood moon" serving as an omen of the coming of the end times comes from the Book of Joel, where it is written "the sun will turn into darkness, and the moon into blood, before the great and terrible day of the Lord comes."
On a small note how many shows play Dies Irae for their ad? Song meaning end times https://www.youtube.com/watch?v=akVEj7NeiQA