Dropped by: Lord Aurius Rivendare
Level . 51
HP . 68,760 Click Here for Loot Table beyond Reins of the Rivendare's Deathcharger.
See bottom of page for video of run through.
Fact: The drop rate for this is roughly 1%.
The five run an hour lockout still applies when entering instances directly.
You no longer need the key to get into Undead Strath.
Falsehood: This does not drop off random trash in Culling of Strath.
You do not have to beat the timer for this to drop.
You can't get into his chamber without shutting down all 3 ziggurats anymore.
There's no way to enter the instance via queue (to get around 5/hour lockout) with someone out of the LFG level range for that Undead Strath.
The video below is by WarcraftInstanceRuns, was my favorite out of the few I looked at.