im a pc player
i have just played against a new comander of monster and try to unlock the new comander as well but i cant see how to do it because she is nowhere in the book and grey out in the deck builder
thx for help
Go to the reward book. At the upper right there should be tiny icons. Click on the boar thing and you should see the trees for the new leaders by the thronebreaker icon. The leaders are unlockable in the thronebreaker tab.