Surviving the fourth round | 13: Devil's Dalliance DMC: Devil May Cry Guide

Fourth round is the simplest one, because you have to defeat only a group of Rage Spawns. The best idea to eliminate them is to use area attacks of angelic Aquila blades (screen above).

If from any reasons you don't want to use blades, you can also use Rebellion or, as the game suggests, test a Fireworks attack of Revenant (screen above).