The encounter journal for the new raid Aberrus, the Shadowed Crucible, has been updated in the latest Patch 10.1 PTR bulid. Definitely review Kazzara, the Hellforged; the Forgotten Experiments; the Vigilant Steward, Zskarn; and Rashok, the Elder as all 4 bosses will be undergo testing on Thursday March 16th and Friday March 17th. Check out the full raid testing schedule here for more information. Aberrus Raid Testing Schedule
Millennia ago, Neltharion carved deep places in the earth where he conducted world altering experiments. After his death, these sites were lost to time, until now. Forces seeking to claim the Earth-Warder's legacy raid his dominion in search for powerful artifacts. Now the champions of Azeroth must venture into darkness and ensure the crucible's dangerous power doesn't fall into the wrong hands. Kazzara, the HellforgedBefore Deathwing, there were many attempts to infuse a subject with Shadowflame. The only one that survived was Kazzara. Driven mad by the excruciating pain inflicted by her elementium plates, she now serves as the ferocious guardian of the Shadowed Crucible.
Overview: As a terrifying revenant of Shadowflame, Kazzara tears open unworldly [Dread Rifts] from which [Rays of Anguish] will seek to exterminate her enemies. Upon reaching 100 energy, Kazzara will unleash a devastating [Hellbeam] from her sinister jaws to execute intruders herself. At 80%, 60%, and 40% health remaining, plates of Kazzara's menacing armor are shattered off during [Hellsteel Carnage], intensifying the chaos as her [Infernal Heart] is uncovered. Read more on wowhead.com