I was exploring the deep dark city in creative mode and with commands on. Giving myself the command [/effect night vision 360] produced a visual effect that seems unintended when summoning the warden. The darkness effect was then applied after the warden appeared. A visual wave of blue would surround lights and attempt to dim them, creating a psychedelic like visual everywhere around a light source. This actually gave me a headache and could be triggering for those with epilepsy.

Thanks for all the work you guys do!