This mission is only available if you chose to Corrupt Eugene at the end of Heaven’s Hellfire .
This mission will appear on your map, but it can only be started if you chose to corrupt Eugene. He wants to go after the Akurans and needs your help. There are some by the construction site, but he needs you to flush them out so his demon friends can get to them. When you get there, get onto the top level and go down the ramp to find some.
Now, you just need to keep killing them until Eugene says to go onto the roof. Here, just continue taking out the Akurans until it’s time to move on (even though there will be more Akurans to fight). Eugene mentions that something big is going on and says to use the signal app from before to locate the next batch of Akurans.
If you don’t remember what to do, get high enough and press up on the D-Pad to bring up a signal. You want to head in the general direction where the distance gets smaller and when you arrive there, there will be a few Akurans to kill. Use the signal app once again to find the next spot, where there will be more Akurans, as well as some DUPs.
At the third spot, there will be a lot of enemies, so make sure you use caution. Once the first wave is cleared, two Enormous DUP Agents show up and things get a little more hectic. Remember to use your R1 attacks here, as they will do a lot more damage than normal shots. Eugene will eventually show again as a big demon and more regular DUPs will appear. Clean the rest of the enemies up and the mission will be over.