4-2

Enemies: Darkfire Elemental, Greater Darkfire Elemental, Frost Elemental, Progenitor, Phantom Rogue, Weaver

4-2 is simply 2-2 but with almost the same changes as 4-1. Hellfire replaces fire, Dark Knights are Darkfire Elementals, Dark Rogues are Frost Elementals, Invokers are Greater Darkfire Elementals. However, there are 2 major differences. First is that the waves of enemies that spawn are replaced by Phantom Rogues and Weavers. Second is at the end, where you usually find the Dark Captain, is now replaced by 2 Progenitors. They are far worse to face since you have far less space to fight than on 3-3. Fight cautiously or quickly eliminate them, and you'll be done and ready for 4-3.