Be the boss Trophy

This trophy is earned as the Kandarian Demon.

Boss units are available after placing a point in the boss category with a high enough threat level. You can summon a boss by pressing  and  once they are unlocked and you have enough infernal energy. Summoning a boss immediately has you possess them and play as them. These are the leaders of each class and are very powerful units. They include Henrietta, Eligos, and Evil Ash. Simply summon a boss 10 times across your games to obtain this trophy. It will come naturally as boss units are the most powerful units at your disposal and you should be using them often.