Sacred Citadel
35 Achievements
500
21-27h
Vengeance is mine
Defeated the boss in Act 2.
10
How to unlock the Vengeance is mine achievement in Sacred Citadel - Definitive Guide
Story related and cannot be missed.
The final boss battle is against the Grimmoc Mama boss. It really is pretty straight forward and the best advice I can give is: dodge roll. Constantly dodge all over the place to avoid attacks. Avoid the purple lightning that she throws and whittle away her life while also taking out her minions. There really is not shortcut strategy.
If you are really struggling, I suggest grinding a little bit and trying to upgrade your equipment if possible. You can also visit town for bottles so that your strongest attack is available and you can fully heal 3 times.
Story related, can't be missed.
In Act 2 Mission 5 Mama's Throne, you will fight Grimmoc Mama. She has quite a few attacks to choose from. She will shock the ground while safe, and you will fight enemies. Then she will come back and you can attack her. She takes a lot of hits but it is a very basic fight.