Board Thread:Game Discussions/@comment-24149689-20140103120654/@comment-24108837-20140103130355

This boss has exactly the same strength as the Deva typed bosses before the winter kings. The 3 Winter Kings were different. They were weaker in the lower levels (up to level 15) and stronger in the higher levels.

The only difference between Deva bosses is the elements. This one has non adjacent elements. That means your strong armors will be at best single strong against it. A mono element boss has the same thing.

Against Wrath Demon even if you have maxed Legendary + armors and a decent guild bonus you will still need 2 knights to fight level 15.

Some bosses are adjacent element (one of their elements is strong against the other). In that case it is possible to have a dual strong Legendary + armor that is strong enough to beat it alone.