Question: where is nekarat the keywarden?
Answer: Nekarat the Keywarden of Fright, Seething Chaos, is a Super Unique Terror Demon located in the Gardens of Hope Second Tier (Silver Spire Level 1 prior to Patch 2.2. 0) in Diablo III, Act IV. Nekarat is also a keywarden. He has a chance to drop an Infernal Machine.