[Esus]

*********SPOILER*********






*****Basically, you add up all the dots on each dice which are around a centre dot. All dice without a centre dot are to be ignored.
If one of the trolls was a five, then you count the four surrounding the centre - add them all up, and you have the answer.
Hence the 'petals' around the 'rose'.
Another name for it is Stars around the moon, I believe.*****