User blog comment:BobaFett2/Inferion Discussion/@comment-4622249-20130831210318/@comment-4964341-20130831211604

The Stromling template was made from an infected minifigure. From there the Maelstrom could create more of its own. Hammer Stromlings were infected repair workers/copies of the original.

It would be easier just as it is easier for a Toa of Fire to make a sword than it is for him to make sword-shaped fire that works exactly like a sword does.