In the web novel and manhwa series "Solo Leveling" by Chu-Gong, the Shadow Army is a significant aspect of Sung Jin-Woo's abilities after he becomes the Shadow Monarch. As the Shadow Monarch, Sung Jin-Woo gains the power to control shadows and darkness, allowing him to create and command an army of shadow soldiers. Here's more information about the Shadow Army:

1. Creation of Shadows: Sung Jin-Woo's primary ability as the Shadow Monarch is to create shadows from the remains of defeated monsters or deceased beings. These shadows are then transformed into shadow soldiers under his control.

2. Variety of Shadows: The Shadow Army consists of various types of shadow soldiers, each with its unique abilities and strengths. Some are humanoid in appearance, while others take on the forms of beasts, monsters, or mythical creatures.

3. Loyalty and Obedience: The shadow soldiers are completely loyal to Sung Jin-Woo and follow his commands without question. They are extensions of his will and can be used for a wide range of purposes, including combat, reconnaissance, and defense.

4. Strength and Abilities: The power and abilities of the shadow soldiers are directly proportional to the strength and abilities of the beings from which they were created. This means that if Sung Jin-Woo defeats a powerful monster, he can create a formidable shadow soldier with similar strength and abilities.

5. Tactical Advantage: The Shadow Army gives Sung Jin-Woo a significant tactical advantage in battles. He can use his shadow soldiers to overwhelm opponents, strategize in complex battles, and deal with threats that would be impossible for him to handle alone.

Throughout the series, the Shadow Army becomes a central element in Sung Jin-Woo's battles against powerful foes, helping him overcome increasingly challenging enemies and obstacles. His ability to control the Shadow Army is a testament to his growth as a character and his transformation into the Shadow Monarch. The presence of the Shadow Army adds depth and excitement to the story of "Solo Leveling."