Search a library for a charred book, either in Qeynos or Freeport for the meaning of the Sigil.
In South Qeynos, enter the Concordium Tower and take the red teleporter and head down the stairs. The book is open on the ground at ( 706, 41, 111 ) Copy/waypoint 706, 41, 111 near the corner of the room.
In North Freeport, head into the Academy of Arcane Science and find the open book on a table at ( 24, -7, -127 ) Copy/waypoint 24, -7, -127
Investigate two more sigils. Find a secret entrance to Everling's Lost Chamber ( -1382, 122, -1874 ) Copy/waypoint -1382, 122, -1874 near Nektropos Castle to learn more about them
The first rune is found by clicking on a bookcase at ( 8, -16, 61 ) Copy/waypoint 8, -16, 61
The second rune is found by clicking on a stack of books on the ground next to the bookcase at ( 41, -10, 103 ) Copy/waypoint 41, -10, 103