During Chapter 3 of Final Fantasy VII Remake, you will receive the word of a giant beast that has taken up residence in the abandoned factory that you just cleared from the drakes. It's a powerful creature, so most of the slum dwellers in Sector 7 won't want to deal with it. Before you can continue this quest, you must locate the area access map.
When you first start the quest, you'll talk to Gwen, who talks to a pair of soldiers. These two aren't interested in helping you out, but she points out how bad the problem is with emptying the plant creature. After speaking with them, you must return to the factory to locate the security card to gain access to the area. You can find the map inside the factory.
You can find it closer to the back of the plant. Continue through this, follow the traditional path. There is only one way to go, deeper into the factory. After meeting a group of Gorgers, take the road to the left. You will go to another area with another group of Gorgers. Take them out, then go forward. On the left side, you should see three boxes. Destroy them and you will receive the security key. You can then come back through the lane that took you to the locked entrance, which is in the other path from the one you chose, then take another to the right.
Behind the door is Cerulean Drake. After using the Evaluate ability, you will learn that they are weak to Wind spells. If they are about to launch an ice attack on you, use any other spell against them, other than ice based spells. He has the potential to drop a Gravity Orb, a Phoenix Down, or you can steal an Aether from him.
After completing the quest and talking to Gwen, you will receive a Star Bracelet.