Auxiliary battle maps and a new music option have been added.
The following auxiliary battle maps have been added:
Battle at Lake Teutates
Battle in the Forest
Battle in the Plains
Battle at the Sealed Forest
Battle at Conand Tower
Depending on your progress, one auxiliary battle map will be displayed on the battle-selection screen.
These new auxiliary battle maps will have a yellow "!" icon on the battle-selection screen. In them you will be able to obtain bullion, as well as stat-boosting items such as Ailell Pomegranate.
You will also receive more gold as a reward from these special maps.
You can challenge any map by spending one activity point.
The new music option ("Corridor of the Tempest") can be selected from "Battle Music" within "General" on the system menu while in an auxiliary battle.
You can also listen to it in the Music Library.

More details on the official game page of Auxiliary Battle Maps ...