Jopal is located to the left of where the zone in point is and is spawned by defeating Arch Mage Yozanni. You require see invis or a totem to see him. He will path around the area ( 177, 33, 139 ) Copy/waypoint 177.27, 32.83, 138.87, ( 181, 41, 55 ) Copy/waypoint 181.20, 40.86, 54.63, ( 225, 42, -18 ) Copy/waypoint 224.62, 41.90, -17.61, ( 336, 46, -30 ) Copy/waypoint 336.34, 46.09, -30.13, ( 345, 53, 65 ) Copy/waypoint 344.83, 52.87, 65.43, ( 346, 63, 173 ) Copy/waypoint 346.34, 62.77, 172.99, ( 292, 68, 136 ) Copy/waypoint 291.77, 67.86, 135.85, ( 221, 66, 66 ) Copy/waypoint 221.10, 65.72, 65.78 and then returns to the first loc point. He is best fought on the plateau at the 2nd to last loc of his pathing loop above.
Healers cure their own curse. He will emote "Jopal curses your healers, they should be careful when casting beneficial spells!"
If you get the reticle/cross hairs (+) on your screen joust away from raid 25m till its gone