Entrance for Qeynos is ( 670, -21, 101 ) /waypoint 669.50, -20.81, 101.49. entrance for Freeport is ( -139, -8, -114 ) /waypoint -138.90, -8.15, -113.50
Finally some light can be shed on the topic here.
There are Cruxes that are needed to spawn the Avatars when you get in. I will cover that first. There are several cruxes required to spawn the Avatars. Here is a chart for all the Avatars. The cruxes can be obtained from all final bosses as a random drop in pairs of 2 or single from Alter of Malice, Rum Cellar Campaign raid zones and the Precipice bosses themselves.
Isle - Location -Avatar - Cruxes
Perception ( 129, 0, -169 ) /waypoint 129.30, 0.14, -168.97 - Avatar of The Tribunal - Justice, Infliction, Truth
Fulmination - ( 61, -0, 66 ) /waypoint 61.38, -0.02, 66.46 - The Avatar of Karana - Fulgimation, Fulmination, Tempests
Consternation - ( -144, 0, -93 ) /waypoint -144.00, 0.01, -93.10 - The Avatar of Cazic Thule - Dread, Horror, Despair
Conflagration - ( -103, 2, 139 ) /waypoint -102.84, 2.28, 138.63 - The Avatar of Fennin Ro - Unquestioning, Squalling, Frightening
Underfoot - ( -71, -4, -245 ) /waypoint -71.48, -3.76, -244.78 - The Avatar of Brell
Here is another chart for the creation of other Cruxs. You can sacrifice 2 Cruxs to create a new one. Just examine a crux to pull this same info up too. Note that the Cruxs Unquestioning Squalling and Frightening can not be created from 2 other Cruxs. The Fennin cruxs can only be obtained from the other Avatars.
Fulmination + Truth = Despair
Despair + Truth = Fulmination
Fulmination + Despair = Truth
Tempests + Infliction = Dread
Dread + Infliction = Tempests
Tempests + Dread = Infliction
Horror + Fulgimation = Justice
Justice + Fulgimation = Horror
Justice + Horror = Fulgimation
So now that you know the cruxes required for the Avatars, let's start on what to do while on the first Isle. Dread Armoloch of Blight and Dread Armoloch of Corruption hold the several keys needed to enter some of the isles. is a x2 mob. Respawn time is estimated to be 30 mins- 1 hr. This name drops keys needed to get to the isle where you can spawn the Avatars. Click on the Alters surrounding the spawn to get to the isle. Each isle has an alter in the middle. Insert the cruxes into the alter to spawn the Avatar. Brell Serilis is already spawned in when you arrive. Have fun with your raid party/group!