The trinket effect reads: “Equip: Your damaging spells have a chance to pull a nightmare star from the sky, creating a pool of corruption that deals 115,947 Shadow damage to all enemies in the area over 10 sec.”
This “pool of corruption” has the same texture as the Affix Sanguine has on Mythic Dungeons.
I don’t think I need to say this, but, it’s creating fake sanguine pools misleading players and creating bad social interactions.