How to get formidable foes in wizarding challenges?

Feb 13, 2019
47
17
11
One of the tasks is to "defeat formidable foes in challenges".
I went into 3 fortresses and just got two of them.

What fortress level should we go in order to get more formidable foes??
What rune? Is it necessary to use the brilliant event rune or any of them is ok?

Thanks!
 
Feb 20, 2019
41
10
13
You're right. I completed the event using brilliant event runes and Ruins V :)
 

papagun

Newbie
Mar 24, 2021
1
0
4
I have been having the same issue. I have spent about 20 stones and only gotten 6 formidable foes. I don't have much left to work with.