Dr. Emmett

 is an NPC located in the and acts as a guide. He is also present in some Dungeon Journals.

Story
After the Calamity took the life of Lathrop's parents, Dr. Emmett adopted him. He was interested in studying The Breach that also came from the Calamity. One day, over thirty years after the Calamity, he asked Lathrop to deliver a letter with details regarding his experiment to his colleague in the. The letter however, was never delivered, since Lathrop went to with Necron and became The Watcher.

Since Lathrop never delivered the letter, Dr. Emmett asked Alatar to summon a copy of it. He threw the letter into the breach, which caused an event that transformed him into the Rift Dimension, to be forever stuck there. He continues his study from inside of the Rift.