Not sure how to introduce this, so I’ll just jump into it
Soothing Bastion and Superior Rune of Vampirism have a terrible interaction with each other. Both of them have an effect that procs once you take damage at 25% hp, and both of them trigger at the same time.
The result is pretty awful. You end up in crystal hybernation while mist formed, resulting in you gaining the break bar, becoming mist (invulnerable to damage, vulnerable to conditions), being unable to move, and unable to use any skills. If the break bar pops, you will get the 25 stacks of vulnerability and the 2 second stun.
Now, clearly this seems unintended, as it will get you straight up killed in spvp. One or the other should proc, not both.