Masamune had the ability to figure out how to mass-produce tinkertech without maintenance issues snowballing out of control. He was able to create the gear utilized by the Dragon's Teeth and top-of-the-line equipment for the Protectorate and Wards, including copies of Defiant's combat engines. He produced nonlethal weapons, although not as good as those possessed by the Dragonslayers.
He also helped produce spare nanothorn knives, although they would degrade in a few days if not maintained.
Masamune was recruited by the Guild and given the task of figuring out how to mass produce their equipment without the maintenance issues snowballing out of control. He was able to create the gear utilized by the Dragon's Teeth and top-of-the-line equipment for the Protectorate and Wards.
He was present alongside the rest of the Guild when they met with Cauldron. He stepped away from his teammates to approach Black Kaze and stand within the mass murderer's personal space for a several tense moments. When Masamune returned to his teammates, Black Kaze followed him.
Later, the two seemed to be travelling as a pair, although Masamune was nowhere to be seen when she engaged Scion.
↑Bakuda is a chaos tinker. Somewhere in line with the field test tinker. Blasto is an Alchemist. Bonesaw likely started out as a Limit but breadth and depth factor in to branch her out considerably. Cask is magi, I guess. I kneejerked a 'no', but I suppose it fits. Chariot is closer to being a mover hyperspecialist. Jia is a simulation architect. Kid Win is closer to being a mastermind. Lab Rat is more a field test tinker (chaos), working his way to valid results by experimenting on others (and sometimes himself). Better to say Alan Gramme was an Architect, but a dramatic shift and change to becoming Mannequin made him a Combat Magi instead. Masamune - Resource Richter - Virus tinker Squealer - probably Hyperspec-Architect Obsessive. Stinger - Hyperspec (Rockets) String Theory - Doomsday Architect Tecton - Tectonic Templar
Ogun - Chaos Tinker-Shaker Particulate - Disintegration/Dust hyperspec-binary. Trainwreck - Crude bodysuit/armor combat-resource tinker & case 53. - reddit comment by Wildbow.