The barrier granted by the passive “Rock Hard” only goes up to 60000 and not the promised 150% of maximum hit points.
I can confirm this. With 30,285 HP and Pulverise, my maximum HP is 40,884:
30285 * 1.35 = 40884
The barrier from Rock Hard should be 150% of my maximum HP, which would be 61,326, but the barrier only ever goes up to 60,000.
On a side note, it is stated in the Pulverise tooltip that my maximum HP increases by 30% when Enraged, but in reality it’s 35%.
Unbridled Wrath ?
Oh, that explains a lot. My mistake. 
I’ve been playing with Rock Hard in Shambala and was surprised by this and went into thinking this was a pvp-specific balance. 60000 barrier strength no matter the role chosen.