Crest Market (Warriors)
The Crest Market can be accessed from the Camp menu. Here, you can trade materials and gold to upgrade your units with crests, which can amplify certain abilities, improve defenses, or provide other benefits. Each unit has three crest trees, for Attack Crests, Defense Crests, and Boost Crests.
The Boost Crests page also includes Skills and the Surge Crest, which allows your unit to promote to an advanced class.