In Tower of Solusek Ro, if you're having trouble climbing that mound to click on the right spot...
Go back to the staircase, run up a bit, be sure you have levitation in some form, and then "float" over to the spot. Should be easy to click now.
In the Tower of Solusek Ro: Hits for a max 1,846.
In the Valley of Lunanyn: Found in the northern part of the zone; part of the event "The Herald of Oratory" (see this quest entry for the group version and this quest entry for the raid version).
In the Sepulcher of Order: Part of the event "The Triune God" (see this quest entry for the group version and this quest entry for the raid version).