Did you played the demo yet? You might already encounter mini boss in game demo. Yes, the one you fought is actually just a mini boss called Dosa. It means "anger" in Pali language, one of the manifestation of human negativity. Each loka will have its sets of mini boss which are the manifestation of human negativity with corresponding concept of each loka. We'd like to show some of them on future updates.
Aside of mini boss, there will also be a Boss for each loka. This time we'll let you know two of the boss, Yamantaka and Ghatotkacha. You might have seen Ghatotkacha. She was previously featured in story of Boma from the previous update. You will face Yamantaka, The Lord of Naraka Loka, as the boss of Naraka loka to continue your journey to the next loka, Preta Loka.