Armatus

Armatization (神依) is a mechanic exclusive to Tales of Zestiria.

Description
Only the characters Sorey and Rose can perform armatization, which fuses either of them with a chosen seraph partner to produce a powerful hybrid form. This form can perform magical attacks indicative of the element the seraph represents. While in this form, the human character's stats are boosted, and they gain special abilities unique to the fusion: the character can wield a large sword and employ fire-based magic (Lailah), shoot water arrows using a bow (Mikleo), use stone fists and summon stone pillars (Edna), or gain blade-like wings and summon whirlwinds (Dezel/Zaveid). A character can swap out their seraph partners while not in this form, and both characters capable of armatization can be in this form at the same time. If the human character is defeated on the field, activating armatization will resurrect them if their current seraph partner is still active. There is a maximum of four party members allowed in battle, with one human being linked to one seraph.