Oroboros ring blast skill is doing damage across the whole screen even if you are outside of the ring AoE circles and doing full damage repeatedly. If you try to dodge them, you can dodge the first 2, but the final ring around him in the center is doing massive screen-wide damage even if you are across the edge of the arena.
Additionally the damage is repeating as well and seems to be doing a “tick” of damage 2-3 times repeating just making you die with no DoT on your bar, or negative effect. Will try to get video recorded as well.