Do not charge ahead as there is a huge blade trap that goes off once you gets near the area
WALKTHROUGH - Upon setting foot in the sewer, you will have the option to enter either the east or west door. Either way you choose Maple Story Mesos, you will end up in a hallway leading further north and onto the final room.
If you choose the west door, you can still go back the way you came in and get to the east door if you wish to get conquest and ransack. But if you just want a quick run, just choose one direction and you're all set.
As for the Ogres, if you can manage to kill them before they start their multiple attacks, then you'll be able to survive their damaging hits. They do hit pretty hard.
In the absence of crowd control, you might want to bring them to a spot where they can be surrounded. As you continue forward, you will encounter an Ochre Jelly and a Huge Violet Slime. It's time to use your Muck-banes. Fire spells work well on these oozes.
As you make the turn, you will see a Large Earth Elemental running towards you. Do not charge ahead as there is a huge blade trap that goes off once you gets near the area going down the ramp with flowing water. Let the Earth Elemental come to you.