So, here are the Ritual Circles that were used for Summoning the Multiversal Entity: Death.
The First one, with the three small circles in a trigram is: Harry Potter's (Anubis) circle of Summoning.
The Second one, with the 'Ankh' is: Achlys' circle of Transmission.
The Third one, with three white circles and wands pointing towards the center is: Perenelle's circle of Fusion.
The Last one, with the multiple runes and hexagons is: Atticus' circle of Conduction.
They each were made for a specific purpose in the ritual, as shown in Chapter 17: The Entity of All Ends.
So, how are these? Do tell!