To answer a few of the questions about Mimics: Yes they were originally concepted as a Halloween breed, but without real expectation that they'd be chosen for Halloween, as I think pygmies have to be very compelling to overcome the disadvantage of being a limited breeding group. I was mainly having fun. I am very pleased though that TJ liked them well enough as a regular release to use them as originally concepted.
They are based on several inspirations. One is vampire bats, both for their feeding methods and general anatomy. They are also based somewhat on myna birds or other birds that mimic sounds. A large part however of their inspiration comes from two separate fiction sources: one is from Lord of the Rings, where Golum is leading Frodo and Samwise through the Dead Marshes and he tells Frodo, sternly, "Don't follow the lights." That whole mechanic that the light has a hypnotic effect to draw you into danger was a main source of inspiration. The other fictional source is the jabberjays from Hunger Games, which mimic the voices of people's loved ones to taunt. In this case, rather than just voices they know, I thought it would be spookier to have the voices of the dead, and hey look, we have death mana to provide lore to support that.
WE SOLVED THE CHART ON THE DISCORD CHAT!
A Siyat's color depends on their natural time left when hatched. If you incubated, add a day to the egg's timer to find the window they are in.
7d 0h - 4d 1h: green (this means you must incubate, earthquake, or try to force with kill for green)
4d 0h - 2d 1h: blue
2d 0h - 0d 0h: purple