Great question! I have an almost fully ascended Grimm (4-58) and I love him!!! He is a staple for me great for everything. Raids, titans and challenges, well except the last event
I pulled a Sonya and another Grimm last month and haven’t begun to level either of them as I also got Perseus at the same time. So I have been building Perseus and will use my ascension items on him. Eventually I will get to her as she is a strong 4 and with Grimm would be great in a reflect nature event.
Who else do you have in your team? Because if you already have Tib or Gormek I would go Sonya first then. I have a Gormek and it’s great the defence shield stacks but the percentage doesn’t double only the number of turns. So I would rather the debuff.