Aaaaaaaaa, I was looking for 3 runes in Ice Cavern and I found two of them (Ice Elmenetals' room and the room with 2 Frozen Bone Magies) but I couldn't find the third. After 40 min. of searching, I gave up...

Does anyone could tell me where is the third rune?

Ill give you a hint,

 

The last one is not out in the open like the other two.

Hmm... A chest, monster or I need to use detect hiden skill... I'm going to look around again.

You wont need detect hidden, I feel it would be cruel if I didnt tell you that :-), I was originally going to go down that path but I felt it would isolate the quest to a limited number of people which I didnt want to do till we have alot more quests.