Nigon is the second underground race.

Perhaps it would be better to implement a classic army structure? That is:
Level 1: basic infantry (something like peasants, low attack, low defense, very high growth rate)
Level 2: basic ranged units (like archers, gremlins: high growth rate, ordinary ranged units with mediocre attack and low defense, penalty in melee)
Level 3: basic cavalry (cavalry is a conditional term; it refers to a unit with high attack, medium armor, medium growth rate, and high speed, i.e., movement range on the battlefield; it can even be a flying unit)
Level 4: elite infantry (medium growth rate, low speed, armored or with thick skin, high attack)
Level 5: elite ranged units, also known as spellcasters (medium growth rate, powerful ranged attack, medium defense, ability to cast spells)
Level 6: elite cavalry (fast, armored unit with powerful attack and low growth rate)
Level 7: special unit (large, bulky, and monstrously strong. Low growth rate.)
In my humble opinion, this structure allows you to quickly develop a tactical advantage on the battlefield, even in the early stages of the game, especially in battles against neutral ranged units. Basic cavalry easily covers the distance to the ranged units and engages them, preventing them from inflicting damage on our ranged units, which can then act freely, while the basic infantry, due to its numbers, decides the outcome of the battle. However, this is just my humble opinion, and considering that I initially thought that the whole idea of reviving Nighon was pointless, I won't be offended if you don't take my opinion into account or even harshly criticize it.