Deep Down Armor Breakdown Blog

While the official Facebook page post is in Japanese, there's a translation of it over at Gematsu, explaining the armor system of the title. While it doesn't go in great detail, there's at least a pretty picture to go with it:

The armor players can equip are divided into several parts, like the head and arms, and depending on the combination of parts equipped, different skills can be invoked.

Given that you're reading the memories of stone statues to go into dungeons, the weapons and armor the player can equip chronicle the era of the statue you read.