The Quest for Truth

The Sea Cartographer only reveals water that you have most likely already explored. To be honest, during the campaign testing, I forgot to mention how useless this structure is in its current location.

There are no missions in the campaign where Markel is alone. But by the fourth mission (he also appears in the third), it's better to have him somewhat leveled up. The main focus should be on Sandro and Lucretia.

Thank you so much for the tactical information! You were spot on, leaving Markel, the chests, and the Phoenix untouched for Sandro ). Markel did a great job overall; I developed his base correctly, taking the Herald through diplomacy and adding 2 stacks (devils, vuths, and warmongers in the Dungeon – a super treacherous Dungeon), turning them into his minions. He then went to switch places with Sandro. I'm still hesitant to land on the islands with the horde, as they also have a cheaty Fort on the hill and dwellings. Luckily, they just chase around the sea and didn't attack the Castle with their main forces.
P.S. I decided to level up Lucretia in the center perk in the first game... I don't know if it was worth it, but it's done now.

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They changed Markel's special ability; he's not overpowered anymore.

I noticed that... which is not good, but diplomacy + the Herald will help to mitigate this problem. Because in the second map, the number of creatures that can be recruited for dark energy after a battle has clearly been manually reduced.