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The Demon Dojo is a character improvement feature available in Disgaea D2: A Brighter Darkness.

At the Dojo, units can be assigned to one of many training plans, granting various bonuses. As units in training participate in battle the training plan gains experience, eventually leveling up and increasing their bonus. Additionally, the amount of units that can be assigned to a training plan is equal to its level.

Name Unlock Effect
Tough Guy Training - Increase HP growth rate by 5/10/15/20%.
Demon Psychology - Increase SP growth rate by 5/10/15/20%.
Kata Practice - Increase ATK growth rate by 5/10/15/20%.
Puncture Training - Increase DEF growth rate by 5/10/15/20%.
Cram Session - Increase INT growth rate by 5/10/15/20%.
Sealing Circles - Increase RES growth rate by 5/10/15/20%.
Target Practice - Increase HIT growth rate by 5/10/15/20%.
Super Treadmill - Increase SPD growth rate by 5/10/15/20%.
Weapon Maintenance Clear Episode 4 Increase Weapon Mastery gained by 5/10/15/20%.
Punching Bags Clear Episode 3 Increased EXP earned by 10/20/30/40%.
Book Stacks Clear Episode 3 Increased Mana earned by 10/20/30/40%.
Love Potion Practice Clear the Main Story Increase Likeability growth rate by 20/40/60/80%.
Weapon Assembly Clear the Main Story Chance to increase a random Aptitude by 1/2/5/10% after each battle.
Waterfall Training Clear Episode 2 Increase Bonus Gauge gains by 5/10/15/20%.
Battle Royale Clear Episode 4 Increase Skill EXP earned by 10/20/30/40%.