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Drake analyzed Henry's Powers, it was something slightly similar to Metal Magic, it was not to the extent of Technomancy because Technomancy didn't simply extend to the creation of metals, but to breathe life into them and make even the smallest piece "alive" to fuse and form even bigger creations. Meanwhile, Metal Magic was the ability to summon metals and ores.
The young knight commander had awakened a rather interesting power, and the metallic shell covering his true aberrant body was all made of this new power, which, in his own crazed state after discovering his true body had stopped being gorgeous and beautiful like he used to be, unleashed this power he had no true control over.
He manipulated this power and summoned hundreds of golden swords, only a quarter as big as his main weapon, firing them at Drake nonstop.
Check "The Protagnist's Sister Is Actually the Strongest"!