Skysight
+15% speed · 15 s
Cast anywhere, even while moving. It has a 2-minute cooldown.
Charged (at a convergence)
1 hour · survives death
Cast Skysight while standing at an Elemental Convergence to also gain Charged. While Charged, each Skysight cast gives 30% instead of 15%. You don't get 30% for the whole hour, so keep casting Skysight on cooldown.
Read Leyline
+50% regen · 15 s
Cast anywhere, even while moving. It has a 2-minute cooldown and can't be used while Innervate is on you.
Attuned (at a leyline)
1 hour · survives death
Cast Read Leyline while standing on a Leyline to also gain Attuned. While Attuned, each Read Leyline cast gives a 100% regen increase instead of 50%. Keep casting it on cooldown.
Spotting one
A convergence looks like a small tornado. On the minimap it's a cloud/portal icon, with no tracking needed.
A leyline is a glowing purple stream on the ground. On the minimap it's a purple circle, and you get a "Ley Line Convergence" aura when you're close.
Anyone can see them in the world, but only Skyborne of the matching faction get the minimap marker.
They move
Nodes on Zephras Isle stay put. Elsewhere they move every few hours, usually with one up per zone (sometimes two in the Barrens). They also differ between layers. Using one doesn't use it up. There are none in dungeons, raids or battlegrounds. Each dot below is a spot where one can appear, so check the minimap as you pass.
Best habit: when Charged or Attuned runs out, find the next zone on your route below and stop at whichever dot is nearest your path. That's one stop an hour, and the buff survives death.
Read carefully: before Oct 26, casting at a node gave you a 15-minute version of the buff. Most players read the Oct 26 notes as removing that, so the 1-hour buff only makes each cast stronger. Blizzard hasn't clarified yet. Oct 26 dev notes