Changes

Reptile "Worms" are mostly composed of [[Flip monster]]s that generate [[hand advantage]] by allowing the player to draw extra cards or add extra cards to their hand or create [[field advantage]] by allowing the player to control the positions of cards and permitting cards on either side of the field to stay or not. The non-Flip monsters allow the player to control the position of monsters on the field and flip the player's own monsters [[face-down]] or have their effects activated when cards are Set face-down in general.

===Duel Terminal Story===

The storyline establishes that the "[[Ally of Justice]]" monsters were created specifically to combat the "Worms" (specifically the LIGHT Reptile "Worms") through a joint effort of 4 Duel Terminal clans. This is apparent through several crossover cards within the "Ally of Justice" series.

Later on in the battle, captured Worms were converted into "A.O.J." monsters (i.e., "[[Ally of Justice Enemy Catcher]]"), which led to the "Mist Valley" clan falling out of favor with the other alliance members. They halted support for the "Ally of Justice" project and continued fighting the battle alone, though this decision was short-lived. The legendary "Dragunity" warriors returned to defend the Mist Valley, once their home, and joined forces with the clan taking up residence there. The greatest weapon of the "Worms" was "[[Worm Zero]]", which traded the threat of endless waves of "Worms" for the crushing presence of "Zero", whose arrival on the Duel Terminal world was enough to severely disturb time and space.

===Design===

Visually, they resemble hideous alien creatures of a predominant single color, and often possess lipless toothy vertical mouths. However, they also incorporate biological features from real-world [[wikipedia:Worm|worms]], including transparent skin and external mucus.