Thank you. I haven't ventured into the dungeon yet. I've acquired the tactics skill, and I've obtained earth and water skills. Fire should be next. The witch's hut will grant me marksmanship. I'm still unsure what to take for the last slot; perhaps pathfinding, although it's less crucial.

Take a look at the map in the editor; it mainly features swamp and titan lands for passfinding, but they only occupy about 10-15% of the surface and 5% of the underground. It's not worth dedicating a slot to passfinding for this. Based on experience, passfinding is only necessary for speedruns. Otherwise, you won't need to run away shouting "Save me! Help!" from enemy heroes, as they are confined to their respective locations. Passfinding isn't needed on this map.