a full list of all the Cenotaphs are as follows.
THOLE:
Forgotten Tombs
House Cellar
Market
Burial Grounds
Catacombs
Lower Catacombs
OUTLANDS:
Desert Cave
Ruins
Oasis
Broken Spear Pass
TAYMURIA:
Border Camp
Hermits Cavern
Moon Wilds
Dura'Tyr
Ziggurat of the Sun
CORWENTH:
Fallen Eagle Pass
Fallen Eagle Fortress
Kyallisar
Sewers
Old Sewers
SURA WASTELAND
Wastes
Supply Camp
Ice caverns
Meltwater bastion
Oracle
Red Smoke Mountains
Red Smoke Camp
The last one you will get will not appear until after you defeated valkyrin in the Oracle thus activating the final one so just make sure you got the others and ….DING