The objective for this mission is to collect all of the 50 Red Orbs within 30 seconds.
Location[]
It is in Mission 10 where you can find it at the right of the statue where you have obtained the Neo-Generator. It is portrayed as a white tombstone-like structure.
Strategy[]
Dante[]
The requirement for this mission is to have Nevan equipped and Air Raid unlocked, since the Orbs are in lines that require flight to collect. There are also White Orbs in the air, so there is little requirement for Devil Stars or maxed out DT slots. So what you have to do is follow the trail of Red Orbs and make sure you don't get out of the track so that you will never consume much of your DT. If using a Devil Star, use it when there are at least 2 slots left glowing.
Vergil[]
Vergil has a different path and does not need Devil Trigger, but needs Dark Slayer Level 2 (which you are guaranteed to have by this point anyway). Start by following the Red Orbs in front of you, into the fleshy cavities. Jump onto the ledge at your right. When you land to that ledge, face the ledge, kick jump and perform Trick Up. Now pass the bridge and stand at the edge of the "cliff" at your right. Then, jump to the right to get two Red Orbs. When you miss the other orb, perform Trick Up. Then, climb on the bus to the higher level of the flesh wall, and then finally to the high ledge by the exit blocked by the tusks. The final Red Orbs floating above it require a well-timed Trick Up.