During this period, the Undead had brought back a significant amount of Hearts of Calamity, which could be exchanged for camp points, and their shards could also be used to feed the Blood Lambs. These hearts were considered the most important strategic resources in the eyes of the Undead.
And Mico could use these materials to help the Undead concoct various Magic Potions, including those needed by the curse-wielding Wizards. However, the Undead still didn't have enough points, and so far, not a single one of them had successfully exchanged for them.
The reason Mico never suspected Lind to be a Noble might also have something to do with the cunning characteristic of Nobles that he occasionally displayed. The pathway Magic Potions were indeed precious, but the Undead, fearless of death, had long since scavenged materials through repeated deadly skirmishes, earning back more than tenfold.