Arcane titans appear to be mechanical constructs similar to the steam armor used by gnomes, but upgraded with abilities performed by arcane nullifiers.
Notable arcane titans
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This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials.*
The name "arcane titan" is taken from the game files as no other name is known.
Some think they are gnomes. It is more likely they are operated by gnomes or just sound like them.