It already ended, so unless he keeps working "luck" is no longer needed.
I actually liked the battle system. The controls in it were very good. But I have few suggestions/bugs:
1) The enemy sometimes doesn't do anything in it's turn. It shows in console that it tries to select spell -1. I guess it could be intentional?
2) There are no health for enemies and especially boss, so I don't know how close I am to killing it. Like I literally fired 25 rays and 10 fireballs and it still didn't die. I tried to figure its health out from the massages in the console, but couldn't. Then, *spoiler alert*, I found out that I was meant to die to it. But because it does so little damage, sometimes it skips its turn and the there are many delays in the fight, it took like 5 minutes for me to die.
3) In one battle I got stuck on a rock/tree/battle area border combo. So I couldn't move.
So I liked the battle system, but it could be a little faster.