Crack

A crack is a dimensional tear in the fabric of space which connects between the Human World and Helheim Forest. Cracks can be controlled by devices of the Yggdrasill Corporation and be used to transport researchers into Helheim. Lock Vehicles can transport Riders to Helhiem by generating cracks and a Rider's Arms forms are summoned through cracks.

However, random cracks have started to appear across Zawame City.

Random cracks are a dangerous phenomenon which causes Inves to crossover into the Human World and attack civilians. An additional side effect of their appearance is the surrounding environment having various fauna and flora from Helheim to appear in an area in proximity of the crack, including Lockseeds.

The Yggdrasill Corporation tries to conceal the existence of these random cracks by having Kamen Rider Zangetsu destroy any Inves they find, the field operatives burning all the plants in the area and presumably, silencing any witnesses who see them. The true reason of keeping this secret is unknown, but it is most likely to avoid panic among the citizens and prevent any potential repercussions of the company's experiments in Helheim and the Inves Games.