Thundax
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There is a village there where the bulk of their potential number is located; perhaps you overlooked it. I didn't play the map myself—with my modest skill level, I thought it would be too difficult, but it turned out not to be quite like that.
I found a quote from a winner on another resource:
"Two heroes went up, and three went right. I leveled up wisdom, pathfinding, and logistics. On the fourth day, they surrendered; on the fifth, I built Dimension Door and jumped. I used a scroll. I didn't sail anywhere. Ghosts were gathered starting from the village around the oases, visiting the artesian spring twice. After the oases, the well—and then to the Castle in the bottom right."
I found a quote from a winner on another resource:
"Two heroes went up, and three went right. I leveled up wisdom, pathfinding, and logistics. On the fourth day, they surrendered; on the fifth, I built Dimension Door and jumped. I used a scroll. I didn't sail anywhere. Ghosts were gathered starting from the village around the oases, visiting the artesian spring twice. After the oases, the well—and then to the Castle in the bottom right."