Crest

A crest (紋章, monshō) is an item used to aid in evolution. The crests may also refer to the symbols of traits that the Chosen Children embodied and drew power from.

Function
When used in conjunction with a tag and activated by their owner exemplifying the trait embodied by the crest in question, they allow a partner digimon to super-evolve to the Perfect level.

Though they were often thought to be the mechanism that allowed their evolution to their higher forms, Apocalymon's destruction of the physical tags and crests proved them to have merely been focus points; the power of the crests lies within the Chosen Children themselves.

The physical crests also exhibit special powers. For example, when Tachikawa Mimi should be knocked out by sleeping gas, her crest shines and revives her, and when a prophecy requires Takaishi Takeru and Yagami Hikari's partners to fire arrows, the arrows appear in beams of light from their crests. They can also project lasso like energy binds which were used against VenomVamdemon.

History
The crests were originally created by Gennai and his comrades, and later stolen by Piemon. At some point he presumably gave them to Devimon, who hid them on Server Continent. Nevertheless, the Chosen Children are able to find them.

During the battle against Apocalymon the physical tags and crests are destroyed, but their power is not diminished and remains within the children.

In May 2000 the Chosen Children surrendered its power to free one of the Four Holy Beasts from the bonds placed upon them by the Dark Masters, temporarily taking away the ability of their digimon to evolve past Adult.

The ability is later restored thanks to the gift of one of Qinglongmon's digicores, through Gennai.

List of Crests
Below is the list of crests in order of appearance in the show: