Aetherial Gate Guide (Courtesy of Isilud Tengile via XIVPads)

Strategy: A quick but difficult gate to get to, which makes it great practice for the hardest gates. The first area has 2 mites, a raptor and a boar. You'll need to walk past while avoiding the aggro of the latter two. Make it to the west wall and wait for the path to clear. The next area has a vulture, then two morbols and three mites after. Walk behind the vulture and wait for the 2 morbols to move to one side and walk right past the mites. Then you're home free.

Strategy: The path on the picture only has non-aggro goblins, enjoy a free gate.

Strategy: A fairly hard gate, but not too hard. First you'll have to avoid a couple of raptors, this'll lead you up to a room full of boars. Here you can either pop a sentinel and choco through, or wait until they're all either to the north or west of the intersection and run down. The boars will leash after you pass the bridge. At the three way intersection you'll find a boar and a few raptors. Wait patiently and run through when the time is right. Once you're past that, the rest is simply walking to the gate.

Strategy: This gate is about as hard as Lichenweed, but I can actually give a clear strategy of what to do. It will still require a lot of patience and a bit of luck to get through. Expect a few deaths. Anyways, the first L-shaped hallway has a boar, raptor and drake in it. Avoid the raptor and drake and wait for the boar to go in the north part of the hallway. Head into the area to the east of the hallway, watching out for morbols, salamanders and an ixali. Wait for the boar to go down to the horizontal part of the hall and walk on past or run if the drake is far enough away.

The area above the hall has morbols and salamanders, be mindful of where they are. The hall to the northeast is another waiting game. Wait for the two boars to go into the north hall and avoid the raptor and drake if necessary. From here it's pretty easy. Go up the ramp to the upper level. There are two ways you can go here. The quickest and more risky path has a boar that you will have to avoid while walking, and the longer and safer path around has only non-aggro goblins and sound aggro mobs that you can walk past.

Strategy: Be careful as you approach the area, as mobs may suddenly appear next to you. I suggest walking before you see the mobs. Just drakes and mites to walk past on your way up the ramp, then wait for a boar to move to the east and you've got your next gate.

Strategy: Ugh, those damn boars are guarding the narrow entrance to this area. You're probably gonna aggro them, it's near impossible to avoid them all. Put up protect and stoneskin, wait till all or most of them are to one side, use rampart and sentinel then chocobo through. With all those defensive abilities up you should be able to take one or two hits, just keep running southwest until they leash. There should be no aggro mobs down there. The best of these abilities is sentinel, don't worry too much if you don't have the others. In the area to the east there are two non-aggro qiqirn, two true sound morbols, and two sight ahriman. Wait for them to go to the top area and sneak to the southwest passage. There'll be drakes and raptors in this passage. Wait for the raptors to look away and walk past. Don't get trapped in the dead end area halfway through the passage, mobs will move into it, and if it's a raptor, you'll need a lot of luck to escape. Don't worry, they get harder.

Update: I did this gate with my LS tonight and it was actually a lot harder to get to this time. I'd say it's as hard or maybe harder than Lichenweed.

Strategy: Take the ramp near the first arrow up to the upper level, being careful not to aggro the raptor nearby. Then take the pathway that doesn't have the morbol in it north. The rest of the way is hard to determine since the mobs tend to move around a lot. Try to avoid the ways that have boars in them as they are nearly impossible to sneak past on narrow paths due to true sound. Otherwise use the avoiding skills you've gotten up until now to get to the gate.

Strategy: Starting from Verdant Drop, head west then north, avoiding mobs as you did before. After going north, there will be drakes, raptors, and salamanders. Walk through here and stay behind the raptors and you'll have another gate.

Strategy: Go up the ramp to the upper level, watching out for the raptor up top. To the east there are 2 salamanders and a raptor so walk past out of the raptor's sight. The rest of the way is just drakes, so walk through and claim your gate.

Strategy: This one is fairly easy. There are some mobs about 50-55 on the lower level that you can avoid or kill if needed. The upper level just has the treants and spriggans. Walk through, trying to avoid the spriggan's los. If the spriggans do aggro you just keep walking or kill them, they aren't very high level. You should be there in no time.

Strategy: Three rooms with a mix of the above mobs stand between you and the gate. Avoid the raptors while walking, should be easy by now.

Strategy: This is one of the hardest gates to get to. In fact, I can't really give you a good guide to get to this gate 100% of the time, mostly because the mobs like to move around quite a bit. The hardest mobs to get by will be the boars. The narrow passages make it nearly impossible to avoid their aggro. You may have to pop a sentinel, chocobo past them, and hope for the best. Be mindful of the mobs ahead of you and definitely expect to die several times. This will be the truest test of your exploration abilities.