Trial of Will

[lauvhk]

What determines the number of runes you get from passing the trial in Magic Academy?

I receive like 7 magic runes in my latest game but probably a lot less, say only 2 or 3 runes, in my other games. There are some remarkable differences though between these gaming sessions:

1. Unlike many previous sessions, I completely forgot about this in my early adventure, only to remember it again when finishing up the Rare Animal quest. So I end up doing the trial at level 12 while it was like level 4 or 5 previously.

2. This time I complete the trial in the 1st round on Hard difficulty, thanks to Fire Rain and low initiative opponents. Do turn elaspe and difficulty have anything to do with the rewards?