Sanctuary – “Crimson Tide” [Campaign 4 – Mission 3]

This helped me: when all the castles were captured in the quest, only three were displayed. I skipped a few turns, and undead emerged from the vortex. I let it capture a castle, and when it moved further, I recaptured the castle, and did this for all of them in turn. In the end, I activated all four altars. Give it a try:cool: