I need to kill a champion Toxic Alchemist for this collection.
There is one on the third level of the Tower of Nightmares. Killed it but didn't get the credit so I guess that was the wrong one.
There is another that can spawn in the open world, near Togatl Grounds in Kessex Hills. It is part of the event: Prevent the toxic alchemist from contaminating Togatl Grounds. the problem is that you need to get a large group together to scale the event up; otherwise you get a veteran Toxic Alchemist and not a champ.
Is there any other way to get the item for this collection?