19.03.2016 12:10
1) In the game, you should enter the Altar structure and select any hero that you want to make stronger.
2) Then tap on the Consume button and choose a hero you want to sacrifie for increasing a level of the main ability. This hero will be added to the sacrifice panel.
3) Tap on Consume to exchange heroes for a level of the first ability.
You can consume several heroes at once. You should remember that they will dissappear after sacrifing. And you can use them in battles. For this sake, you have to sacrifice slimes, which can be hired with shards.