For red heroes, I have the following maxed and thinking of Limit Breaking Octros next.
C Marjana +20
Waiting for rings are Russell, C Vanda and Nadezhda (all 3/70). I recently pulled C Santa and will level him up to 3/70 as well.
At the next level down (2/60), I have Grazul, Yang Mai, Azlar and Khagan.
Who is the most deserving of rings? Or should I wait in case I pull a great hero like C Black Knight in the upcoming Challenge Festival? Fingers crossed…