Doormaker was capable of opening and sealing portals between places, including between dimensions. He normally used this power to transport members of Cauldron wherever they needed to go and was effectively the gatekeeper to their facilities. His power allowed Cauldron to pick up test subjects, that would become Case 53s, from everywhere, but Earth Bet, and dispense them in desired locations after the transformation.
Large amounts of energy disrupted his portals, including Ash Beast's power. His portals collapsed when the edge made contact with lava.
He was considered to be a Noctis type cape, capable of functioning without sleep without any significant detriment.
Once his power stopped working, the well of energy that his shard drew on having run dry, Khepri released him. Teacher gave him a power that allowed him to communicate, so he could explain what he had seen while tied into the Clairvoyant alongside Khepri. Glaistig Uaine killed Doormaker and began using his power for herself.
↑ 3.03.1At the very back of the room, separate from the group, were two pale young men, laid out on desks that sat on either side of a reinforced door. A twenty-something guy with flat skin stretched over where his eyes should be, and a guy that was maybe ten years older, with enough bloody bandage around his head and face that I couldn't make out his features. Doormaker, I could assume, based on what I'd heard upstairs, along with the clairvoyant the Doctor had mentioned in the past. - Venom 29.7