Gretta Perley, also known as The Iron Witch is a recurring character in Season 2 of Wynonna Earp.
Gretta is the sister of a previous character, The Blacksmith. She was upset by her death and blames the Earps for it. To get revenge she makes a crooked deal with Waverly Earp to get the genie demon Marzaniok. She wishes for Wynonna Earp to disappear.