Formed from another - Both alike but with different names. Your guess they are formed from one another?
different color and different terrain - The two variations of it are of different colour
my passage lies lower than before - Boss1 attacked en route North to Alexandra, Boss 2 attacks en route south to Treno?
my maker a man of many reputations - Formed of the Mist? Or are you talking about Gargant Roo?

Ralvuhrava/Ralvuimago?