So far I've tanked every single boss I've been involved with in the zone (mostly just Groot and Ogre king at times) because it's pretty much impossible to find another tank in that zone. Everyone wants to go DPS which leaves tanks and healers a rare commodity.
Anyhoo, I managed to get the Ancient Artifact twice and became god (have almost full set of Primal Combetants PvP gear and my HP flactuates between 400k to 550k hp in Ashran with it) I lost the first one because of time limit I guess? I had it and then it disappeared from me for some reason, didn't die or anything, it just left, dunno why. The second time I had it, I had it for a long ass time and finally died because someone managed to TS me off a bridge and I lost half my HP and then literally 20 people descended upon me and took me out. I killed a bunch on my way out, was very fun. Had almost 1 million HP with it and DS'd for about 100k.
Also managed to coordinate with a healer friend and both of us pushed back 30+ attackers by ourselves. I'd DS twice to get full death runes, then I'd jump in the middle of their raid, Outbreak someone and then spam BB and the healer would throw that Ashran wand buff on me that makes me tick 60k AoE damage for 15s. I'd use that in combination of defense CDs and healing and kill almost everyone of the attackers. Was super fun.