Earth Spirit Camp should be a blueprint for a troop type building.
From the description, it seems that a type of troop called the Earth Spirit's Daughter can be recruited from the Earth Spirit Camp.
Last time, the purple-quality [Lionheart Knight Training Camp] I acquired allowed me to recruit eighth-tier troops.
So, the purple building blueprint I have now should provide troops of a high-rank.
Once it's constructed, I can examine the properties of the Earth Spirit's Daughters.
Troops of living creatures present a burden on the territory's food supplies, so only effective troops are suitable for large-scale recruitment.
After examining the two building blueprints, I continue to look at the equipment blueprints.
The first one is a purple-quality weapon blueprint.
[Warrior Gladiator's Sword (Purple): 2 cast iron blocks, 5 Fine iron, 2 thick leathers, 4 metal components, 2 mithril.]
(Description: Sharply bloodthirsty, it brings the warrior to the winner's throne.)