All of them are in the zone where Shieldring Keep is located, forgot the name. Same zone with House of Ballads. It's fairly large so you might have to look around. I only got a purple longsword out of one of them and the rest were terrible.
There are a bunch of them in. . . that woods right to the right of Gorheart's zone, the one that has the first Warbound Keep and the House of Ballads (forget the zone's name). Most of them are these stone cylinders, and all of them have curses that need dispelling. They are scattered all over the place there, at least 3-4 of them.
While not listed in the quest log, you can acquire four different keys to open the four Statues of Amman located in the east half of Odarath. The first key you can find is at the Corner Shop, you have to buy [AMMAN'S KEY - WINTER] or find it in the [ABANONED SACK] in the first Red Legion Camp. The [AMMAN'S KEY - AUTUMN] is found during the quest Crisis of Faith in the Waterhall Downs. [AMMAN'S KEY - SPRING] can be found in the House of Ballads' Summer Sanctuary in a [CHEST]. [AMMAN'S KEY - SUMMER] can be found in the House of Ballad's House of Accolades. Journey to the four corners of east Odarath and you will find one Amman Statue in each.
- From my guide that has yet to be published. If there are any discrepancies let me know, but that's where I found everything.
Contributor name: noz3r0 Currently writing a guide for: Kingdoms of Amalur: Reckoning