Ember doesnt have an awakening. The main issue with ember is she feeds the enemy team a ton of ultimate charge and doesnt do enough damage to mitigate that.
Having started playing around 3-4 months ago, and being level 86 atm, I remember very well how Ember has been performing along the way (on opponents, since I don't use her). In the beginnning till around level 40-60 she was very, very powerful. At at 60ish she started to decline. At 70-80 she is getting worse and worse, she is not that bad, some teams do use her very effectively with lots of AOE magic and reducing opponent's magic defense. Those teams are squishy, but they DO kill fast! So, she is kinda ok in those teams. I feel like her ultimate is the worst thing about her though, her other skills deal pretty decent constant damage. Her ulti just gives everyone energy, does crap damage, is interruptible by almost everything... Horrible ultimate.
So there are only certain heroes who have awakenings? Maybe I'll switch her out for Ariel instead.
Ariel kinda suffers from the same problems as Ember. She destroys in the beginning, but later she just feeds the enemy with energy. She does have some utility later still, she is more resilient with her shield, her ulti does decent damage and is instant, the silence is pretty good. Definitely better than ember,