Stand Arrow

Abilities
When a living creature is pierced by one of the Arrows, it will catalyze and awaken the individual’s dormant Stand.

The reason the Arrows can awaken Stand abilities is because the meteorite the Arrows were made from was host to an alien virus. The virus is a merciless one, with most people who contract it dying. However, a small number of people possess an abstract trait that allows them to survive, and as if to reward this trait, the individuals Stand is manifested.

This process has been described as being similar to natural selectionW, the evolutionary process in which some creature better adapt to their circumstances than other and thus survive more easily.

However, if the target lacks sufficient spiritual strength, they will die if the wound is fatal. On the other hand, the Arrows normally only seek out (and pierce) those who can handle the strain to begin with.

Arrow piercing Stand users or Stands
When someone who is already a Stand user is pierced by the Arrow, such as the case with Yoshikage Kira, the Stand in question gains a new ability. It should be noted, however, that in the only known example of this, the Arrow has had to move by itself and pierce the Stand user willingly.