Did this today. At least not mezzable with Bliss... Still snareable/rootable. Did this event boxing 70dru, 70ench, 70war, tank clr rog mercs. Have lots of HP, but were cake. Pulled the 2 pairs individually at bottom, serenitied the top 6 in attempt to single pull, but got 3 anyway, also aggroed the conduit?! which obviously didn't add. Merc aggroed 4th. With 8 down Main mob popped with last two up top. Rushed in and couldn't slow, kept getting resisted even after tashed, possibly due to being out of melee range. Slowed reborns and just dotted with chanter and rained with Druid. Spot healed on occasion, but probably wasn't necessary. Ended with more than half mana on dru without medding up before main fight. No problem even with Juggernaut not slowed. Rampaged a lot. Juggernaut yellow to 70.
The Reborns hit for about 600, and are snareable and mezzable. I'm assuming slowable as well, though haven't verified that yet.
These guys pop on the platform near the entrance to KT. Once a druid at the right part of their epic 1.5 comes near the platform, the mobs on the platform will despawn, and Ritual Conduit will spawn along with several Reborns. There will be about 8 Reborns around the Conduit, 4 on the lower platform, and 2 at the foot of each set of stairs. Once the Ritual Conduit spawns, you have about 30 minutes to kill enough Reborns (about 6-8) to force the Ritual Conduit to respawn as the Noc Juggernaut and to kill the Juggernaut.