Armor

Armor (アーマー体, Āmā-tai) is an alternate path of evolution that causes less load on the Digimon's Digicore.

Originally, using a Digimental, a Child Digimon could evolve into a special armor form unique to the combination of the Digimental. This is useful if there are any factors prohibiting normal evolution. Eventually, however, Armor Digimon began to be treated the same way as Adult Digimon, and most of them can be considered Adult Phase Digimon.

If a Digimon is forced to use a Digimental the power tends to drain away, but if they are properly compatible, the evolution will sometimes jump up to a form at the same level as an Ultimate

In general, if a Digimon used a Digimental to evolve to the form, its considered Armor Body - while attaining it naturally makes it Adult Phase. Although usually Child Digimon evolve into Armor forms, other Digimon such as Adults (Tailmon for instance) or Hybrids (Agnimon) can evolve into Armor forms. Generally, Armor Digimon can eventually evolve into Perfect, just like Adult Digimon.

It's possible to evolve into an Armor form without a Digimental, but the power of these vary, so the level of the armor form is sometimes indicated based on how much power it has.