With the Dimensionator now in your possession, head to the other side of this room (with the tourbot in hand) and you'll find an elevator. This will be the final time you need the tourbot, so you can discard him afterwards. In the gift shop, you'll be ambushed by a few Nethers. These ones are similar to the ones you fought earlier in the game, except they have a boomerang-like saw that they can throw.
After taking down the warriors, one of the winged ones will appear, so remember to jump when you see it charging up its attack. Kill it and head outside, where you can take the taxi to go to the center of the city. Your next objective is to take down four Netherbrutes, who are bigger versions of the flying ones you've fought.
In addition to the laser attack that you're used to, they can also throw these portal machines on the ground that will keep spawning the warrior Nethers you just fought in the gift shop. In fact, you get a taste of these machines in the immediate area after getting off the taxi. You should always try and destroy these first before going after the Nethers.
As mentioned before, there are a total of four Netherbrutes in this area, who are all in circular areas. When you get to these, Nether enemies will spawn and once you've killed them all, the Netherbrute will get into range and start attacking. Remember to take out the spawning machines, as things can get very hectic, very quick. If needed, feel free to return to the weapons vendor to replenish your ammo should you start running low.
Note that one of the Brutes is located in a tower that you get to from a series a ramps. When all four are gone, a new path opens up, so take it and avoid the cars while in the tunnel. You'll meet up with Neftin and the others, and it will be time for the final boss. Make sure you have full ammo and feel free to upgrade your weapons if you want. If you have any armor available to buy, do so.
