Whenever you Overload, gain +1 Attack per locked Mana Crystal.
Sure, they're ugly, but they live in tunnels. You try your beauty routine without natural light.
Overload - You have X less mana next turn.
How to Unlock Tunnel Trogg
Unlocked in Uldaman, in the League of Explorers adventure.
How to Unlock Golden Tunnel Trogg
Crafting unlocked in Uldaman, in the League of Explorers adventure.
Tunnel Trogg Sounds