Wurm

The wurms of Ravnica most often are found wreaking havoc in the Gruul wilds or have been trained by the Selesnyan Conclave. The Golgari have also been known to raise wurms as zombies. The wurms can travel through solid rock, temporarily rendering stone into a state of liquid by use of subsonic frequencies.

The Selesnya Guild uses worms as living weapons; they cover the wurms' heads in giant metal plates, turning them into battering rams. The siege wurm and armada wurm are both Selesnyan, as is the massive autochthon wurm, one of the largest creatures on Ravnica—second in size only to the worldspine wurm. The autochthon wurm is so long that it was said that it took an entire day to walk from its head to its tail.

The Gruul Clans used three types of wurms to wreak havoc: the ruination wurm was a giant creature capable of easily wreaking a building. The streetbreaker worm was lightly smaller than the ruination wurm, but was no less destructive; it would burrow underground, before bursting onto the surface and causing massive destruction. The streetbreaker was more segmented than the ruination wurm, with an angular, draconic head. Finally, the Gruul used the battering wurm. This species was segmented, similarly to the streetbreaker, but it was more insect-like; it had small, vestigial legs on some of its segments.

The worldspine wurm is the largest species of creature on the entire plane of Ravnica. Worldspines are not associated with any Guild; they are extremely rare, and are too powerful to tame. Worldspine wurms, besides being able to pulverize entire districts of Ravnica, are nearly impossible to kill. They can survive being cut into multiple pieces; the pieces can simply grow into more worldspine wurms. The worldspine has a unique physiological feature among wurms on Ravnica: rather than having a two-part mouthpiece, the worldspine has a round mouth ringed with teeth. Each segment has its own mouth, so each segment can theoretically consume food if the segment in front of it is removed.

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