This is a shared group task (a group is recommended in era), but can be technically be done solo.
Rewards: 11 Chronobines, Iksar Right Lower Arm Bones, Experience, Faction
To obtain this task you’ll need to loot a Sealed Letter from a Sebilisian messenger in Field of Scale. Two different versions of Sealed Letter can drop. The one you need for this quest shows specific lore when you right click it. The Lore you’re looking for is shown below. This is a common drop.
Various a Sebilisian messengers can be found roaming around the zone. Some easy spot to get them are outside of Kurn’s Tower and near the fortress door in the Southeast.
Once you have the correct Sealed Letter give it to any of the major dragons in the middle of the zone to receive the task Raising Cabilis.
Kill 2x a Sebilisian bonecaster and 8x a Sebilisian bonetrooper. These can be found in large packs of mobs the southeastern part of the zone outside the fortress door. You can also find them in other smaller camps on the south half of the zone.
Hail Jaled`Dar to complete the mission.