The_Broken_Mirror Information & Guides:
Raid progression and flagging looks like this:
The plan is that the first two zones (Sul Vius: Life and Sul Vius: Decay) will drop keys you need to get to the second set (Plane of Health and Crypt of Decay). Those two drop stuff you need for Crypt of Sul raids.
NOTE: The list here will fill in over time as entries are made into the Allakhazam database. See the quest entries for event details and loot information, the zone entries for the zone overview, and the bestiary entries for individual raid mob listings.