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Thanks to the Onyx Hammer Venerable, everyone had shinier and stronger equipment than ever before, and even Drake's children received upgrades to their weapons. Drake helped with those because he loved his daughters too much to let the old man handle the weapons he had made, and he learned a great deal about his techniques in the process, using his Mimicry Skill to mimic him and copy his abilities. Once the mimic form had gone, he retained some of that mastery every time.
Augustus, of course, called him a damned cheater and grew really angry whenever he did that, hitting him on the head with his hammer, so Drake ended up just learning from him directly... as annoyingly hard as it was.