As stated on the Community Discussion forum, the aquiring of the FoW monument is currently bugged. Even if you complete all of the quests in the Fissure of Woe, half of the time you won't be rewarded with a monument.
Last night I tried it with 7 alliance members and one hero. We cleared every single quest, had no disconnects, but still no monument. Hours of work for nothing.
Additionally the quest "The Hunt" is also still bugged, making it harder for the entire party to get the monument anyway. If someone takes the quest "The Hunt", the first Shard Wolf spawns right in the middle of a mob of enemies and is instantly killed. Anyone who does not have the quest yet before this happens can never complete it during that run. The Shard Wolf only counts as killed, if you got the quest before it was killed. This needs to be fixed badly. It's a bug that's been there since the beginning.