Text on Dispel magic
Choose one creature, object, or magical effect within range. Any spell of 3rd level or lower on the target ends. For each spell of 4th level or higher on the target, make an ability check using your spellcasting ability. The DC equals 10 + the spell’s level. On a successful check, the spell ends.
Text on Favor of Darkness
Starting at 2nd level, by presenting your holy symbol and spending a use of Channel Divinity, you can flood a 30-foot radius centered on you with magical shadows.
I can add more relevant text if needed but I could add some if needed.
I don't see any spell level associated with it but it is definitely a magical effect. Can this be dispelled? Why/Why not? Are there any checks associated with dispelling this?