>2. Make a monster

So I've had this idea for a while in doodle form, maybe you guys can help me flesh it out!

this creature has three stages
>stage 1
cannibal dwarf like thing that wants to eat hearts, very tough and resilient but not highly damaging

>stage 2
eats enough hearts, it grows a second head
loses some hit dice, gains magical ability

>stage 3
after consuming it's body weight in hearts, stage 2 enters gestational stasis. one week later, stage 3 emerges huge fat three headed
very weak, but can now spawn one stage 1 creature per X time, as well as use it's magical ability


this seems like a fun threat that has potential to be a major crisis, and i've got an idea about how to stat it

my main question would be where does the initial stage 1 creature spawn from? the ol chicken or the egg