Devil May Cry 4 - Secret Mission 06 -- Vermifuge
When: Mission 10: Wrapped In Glory
Where: Security Corridor
Objective: Eliminate all of the Chimera before the Scarecrow is taken over.
You'll probably need Air Hike to accomplish this one, so make sure you have it. The objective is to kill all of the Chimera before they can merge with the Scarecrow. This appears to be a difficult task at first, as the Scarecrow starts off surrounded by a mess of them. However there is one way to ensure its safety.
The Aegis Shield attained after besting Angelo Credo adds the Hold ability to your repertoire. To use Hold, hit the Scarecrow with Buster, but hold down the Devil Bringer button. The Chimera Seeds are rather fast, and Nero is reduced to a stroll while holding an enemy, so you'll have to jump and Air Hike to avoid the Chimera. Jump towards the steps that lead up to the area at the eastern end of the map. The Chimera will not enter the fountain area, so carry the Scarecrow far into that area and throw him down. Afterwards, head back down the stairs and tear about each and every Chimera Seed with Buster. Collect the Blue Orb Fragment after completing the objective to clear the mission.