Relevant if you have a mage only:
At zone in, lev and invis, and bard speed preferably.
The zone in island is higher than Black Jay's island, so you can head your mage out the tunnel, turn left, and jump completely off the first island, and make your way around to above black jay safely, then circle down.
To the next island, from Black Jay you can run to the waterfalls and swim up. These are safe unless someone trained a see invis into them. When you reach the topmost, you should be able to see the dome of thorns where Firiona Vie is. You can turn left from your position and run across the hilltops, avoiding the storm, to get a little closer. Inside the dome are some wandering see invis echo hunters. Run across from your location and enter the dome, locate the ramp up a little ahead and to the right of you. Run to there and head up the first ramp, if you picked up aggro from an echo hunter then use drape of shadows to fade it. Head up the rest of the ramp network, there's only non-aggro plants on some of the platforms.
On the next isle, you can hug the edge of the terrain to your left to avoid the storm, and run around to just behind Assistant Scribe Kaelir. Since no wanderers come here, I like to COH my group and reset campfire here in case I manage to get killed on the last leg. Refresh selos/invis and head up the last set of ramps
From Kaelir, you can follow the south edge of the island toward the west, avoiding the storm. I don't usually encounter any SI here, and can head up the ramps safely to the next isle. To get to the Relic teleporter, from the top of the ramp there's a small hill ahead of you which you can climb, then orient yourself toward the hill cluster where the teleporter is and run across, this usually gives you enough height to avoid any aggro from SI on the island floor. Once in the hill cluster, reorient yourself toward the teleporter area, head over and COH your group. I've never encounter SI in the hill cluster except for the named, and wanderers don't seem to come through the teleporter platform.
The last island kind of stinks, though you can safely make your way (invis) from the relic TP to the ramp, and up to the top of the ramp while double invis without pulling aggro. But once at the top there's a lot of wandering SI and you'll likely need to fight through
