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Unit descriptions (I will be posting them gradually):
1A. Mole
Moles lived deep underground long before the appearance of humans; the Underfolk learned how to find and tame them.
1B. Giant Mole
Giant moles live even deeper than their brethren, which made them even stronger.
1C. Rabid Mole
Some moles become infected with rabies, which makes them weaker, but their bite infects their enemy as well.
2A. Troglodyte
Troglodytes are eternally hungry creatures that love dampness and darkness.
2B. Hell Troglodyte
Hell Troglodytes have grown spines and gained much greater strength...
2C. Starving Troglodyte
Starving Troglodytes are kept in dungeons for years, which makes them much hungrier than their brethren, but also weaker.
Further on, I made some changes (now, the underground creatures, vermin, and parasites are stronger than the Underfolk, warriors, and giants).
3A. Underfolk
In their free time from war, the Underfolk are engaged in mining, so they are armed only with pickaxes. By the way, if there are more than 50 Underfolk in the castle, then for every 50 (inclusive), 1 unit of ore will be added weekly.
3B. Underground Warrior
Underground Warriors are trained from childhood in only one thing - courage, and therefore, armed only with short swords and shields, they will fight to the last (if the warriors are in the army of the Child of the Dungeon, they will not refuse to fight even with minimal morale).
3C. Underground Giant
They are not giants, of course, but they are still much taller than their brethren, they have no armor, and their only weapon is a huge bag on their back, which contains up to 5 stones (another 1 is always in their hands, and the last one cannot be thrown; they can only use it to hit in melee combat).