Talk to H’loonh in Wineport and accept the quest Treasures and Tribulations.
If you need more help, check out this questguide from gamerescape.
Have a gatherer in the desired map level range. You can only gather one every 18 hours.
You can also buy them from the MB, since they are tradeable.
But you are only able to store one of a kind per inventory. If you want to you can mail them back and forth with friends so you can use the 20 item-slots of your mail system. Do not forget your retainers! Usually if you buy them from the MB they have a solid return on investment if a portal pops.
It is recommended to have the full map / flying unlocked for said expac.
|70||SB (4.0)||Uznair (Dungeon + Altars)||Gazelleskin|
|80||SH (5.0)||Lyhe Ghiah||Zonureskin|
Dig at said position to unlock the Chest, beat some Mobs (level according to the map) and get your price.
Portals are a special feature added starting in Heavensward.
~ Here the HW dev entry ~ (explains the concept)
~Here the 1st SB dev entry~ (explains gambling)
The Shifting Altars of Uznair are special to the SB maps. It is a roulette type dungeon. Check it out when we go for maps 🙂