In a recent quest I did, The Vault of Night, my character received the effect "Deep Tar" (a relatively common Double Rainbow effect at present). Despite initial healing, once I realised what it was, I allowed myself to die. It persisted through death, and once I was resurrected, killed me again. You can see it still on me after my second death in this screen shot:
Thankfully, logging out and back in removed the Deep Tar effect from my character.
My character was in the Draconic Incarnation epic destiny, and had the twists of fate: Double Rainbow; Prism; and Rejuvenation Cocoon. I am fairly certain that my Deep Tar effect was self-inflicted, though I am not positive there were no others in the party who were Shiradi Champions or had Double Rainbow Minus Rainbow twisted. I suspect the culprit is Energy Vortex, since I think I noticed a correlation between activating it and taking large damage (though I of course activated it when near many monsters). It could be something else though, perhaps Energy Sheath. Also, this combination of epic destiny and twists of fate is one I use quite often, so it's certainly not an issue that is common (presumably only 7% x some other small %).
I'm not sure if this is a known issue, but can anyone confirm that Energy Vortex is the culprit? Or if not Energy Vortex, what might be?