In the base game you are looking for 3x Scatters to hit the “Rise up Spins” feature where, if you clear all the blocks by hitting additional scatters you also unlock “Testament Spins” where all the features available in the game are active, moster potential!
The game is based on three songs, Dark Roots of The Earth, Cold Embrace and Throne of Thorns. Pay attention to which song is playing in the background, when you hit 2x scatters you activate “Song Feature” giving you different ways to win depending on which song is playing.