Proxima Midnight was one of Thanos' children and a member of the Black Order. After retrieving the Space Stone with Thanos and her siblings, she and Corvus Glaive ambushed Vision and Scarlet Witch in Scotland, only to be defeated by Captain America, Black Widow and Falcon.
Later, she and Cull Obsidian led the Outriders to invade Wakanda. She confronted Scarlet Witch, and was about to kill her, when Black Widow and Okoye interfered. As she was about to kill the two, Scarlet Witch used her telekinesis to throw Proxima Midnight into the path of a large war machine, crushing her.
Powers and Stats
Tier: At least 9-A, likely higher. 7-A with weaponry
Name: Proxima Midnight
Origin: Marvel Cinematic Universe
Attack Potency: At least Small Building level, likely higher (Captain America required help to defeat her. Was able to defeat Black Widow and Okoye). Mountain level+ with weaponry (Black Widow was able to use her sword to injure Corvus Glaive. Blasted Scarlet Witch and Vision)
Lifting Strength: Class 50
Striking Strength: At least Small Building Class, likely higher
Range: Standard melee range. Extended melee range with weapons
Standard Equipment: Spear and sword