Rance IX:Fortress

Overview
After the middle of the Chapter 4, you unlock one more big feature of the game: the Fortress. It allows you to use some skills from its facilities on specific maps, like the Fortress Defense ones.

The Fortress's map is a 21 x 16 grid.

Each facility is consume on use, you will need to replenish them between stages if you want to use them.

Facilities effect

 * Yellow facility: Increase the Hitpoints of the core.
 * Green facility: Shoot a laser in a line and damage all the enemies that it hits. Cannot be evaded or parried.
 * Blue facility: Create a shield on the map that can reflect enemies attacks and restricts their path as long as it is alive.
 * Purple facility: Allow you to move any unit (friend or foe) anywhere on the battlefield.
 * Pink facility: Enable a friendly unit to "Act" a second time. (Move and Attack)
 * Red facility: Create a bomb, that you can equip a character at the beginning of a battle (just above where your Red Crab Orbs stands). This character will need to move onto a pack of enemies, and use the bomb to damage them on an area of 2. The bomb temporarily replaces the unit's special move (Left skill button) until the bomb is used.

Facilities upgrade
Thanks to the Japanese wiki and Azraeth's pastebin for all of these information.