Demon Force

Demon Force is a system that allows you to improve a demon's stats beyond what rebirth and leveling can do through feeding consumables and other items to your demon through the interface provided. To unlock it, you will need to complete Quest: Research achievements in the outland in the Cathedral in Ikebukuro.

Each stat that can be increased is called a Force Parameter. Every 1,000 points in a force parameter will increase that stat by 1 and there is a limit to how high each parameter can be increased. They are as follows:

HP: 500,000
MP: 100,000
Strength/Magic/Vitality/Speed/Luck/Intelligence: 50,000 (each)
HP Regeneration: 100,000
MP Regeneration: 10,000
Cls-R/Spell/Lng-R/Support: 40,000 (each)
Critical: 100,000
Pdef/Mdef: 50,000 (each)
Critical Defense: 100,000
Experience: 300,000
Ailment Resistance: 50,000

However, feeding consumables to your demon does not only increase these stats. Every time you use an item in devil force, it will increase the overall Benefit Gauge. At certain points, you will receive a random passive as a bonus. These passives can go in the Force Stacks that every player demon has.

All demons start with having a specific amount of Force Stack Slots where passives can be assigned. It is possible to unlock all eight on any demon (excluding most variants) through Mitama Fusion. These are the default Slots per demon:

Law Demons

Slots:	Demons:
8	Zhu Que, Jatayu, Sati, Fortuna, Freya, Sarasvati, Ameno-Uzume, Anzu, Furiae, Zhen, Onmoraki, Dominion, Virtue, Power, Principality, Archangel, Angel, Ogre, Badb Catha, Aello, Ocypete, Celaeno, Macha, Harpy, Purski, Dis, Isora, Titan, Ubelluris, Sudama
7	Tharmas, Urizen, Urthona, Luvah, Tao Tie, Cyclops, Bucca-Boo, Kodama
6	Albion, Tajikarao, Kinnari, Knocker, Lucky Hua Po
5	Alilat, Thor, Pazuzu, Baphomet, Yata-Garasu, Suparna, Phoenix, Hathor, Take-Mikazuchi, Gurr, Hresvelgr, Moh Shuvuu, Ose Hallel, Hecatonchires, Edimmu, Rakshasa, Ganesha, Jinn, Efreet, Onkot, Apsaras, Sarutahiko, Dwarf, Hua Po
4	Rafael, Odin, Indra, Thoth, Garuda, Mishaguji-Sama, Feng Huang, Scathach, Omoikane, Camazotz, Throne, Girimehkala
3	Gabriel, Uriel, Atavaka, Samael, Lakshmi, Norn, Amaterasu (F), Amaterasu (M), Morrigan
2	Metatron, Seraph, Mithra, Seth, Nyarlathotep, Mada, Pallas Athena, Flauros Hallel
1	Michael, Vishnu

Neutral Demons

Slots:	Demons:
8	Tan-Ki, Orthrus, Cait Sith, Tam Lin, Troll, High Pixie, Cu Chulainn, Valkyrie, Setanta, Catoblepas, Mothman, Gyuki, Garm, Naga, Nozuchi, Fomorian, Lilim, Baby Goldfish (Black), Baby Goldfish (Gold), Baby Goldfish (Red), Baby Goldfish (White)
7	Erthys, Alice, Alp
6	Beiji Weng, Jack Frost, Frost Ace, Bicorn, Succubus
5	Mot, Guede, Chernobog, Hel, Shiisa, Cerberus, Nekomata, Inugami, Cu Sith, Oberon, Vivian, Elf, Kelpie, Gandharva, Pyro Jack, Pixie, Aquans, Tao Wu, Fenrir, Nue, Vouivre, Raja Naga, Mizuchi, Queen Mab, Kaiwan, Incubus, Empusa, Anubis Sphinx, Narasimha, Nandi, Kaichi
4	Bai Hu, Sleipnir, Chimera, Senri, Apis, Unicorn, Dawon, Flamies, Aeros, Jeanne D'Arc, Pale Rider, Black Rider, Red Rider, White Rider, Hell Biker, David, Matador, Aramitama, Nigimitama, Kushimitama, Sakimitama, Hanuman, Kresnik, Hayagriva, Kurama-Tengu, Raiju, Yurlungur, Yamata-no-Orochi, Xuan Wu, Makami
3	Kirin, Bai Ze, Pa Bil Sag, Titania, Trumpeter, Yoshitsune, Daisoujou, Loa, Barong
2	Mother Harlot, Tokisada, Lilith, Black Frost
1	Nyx

Chaos Demons

Slots:	Demons:
8	Mou-Ryou, Suiki, Yomotsu-Ikusa, Oni, Turdak, Momunofu, Azumi, Chatterskull, Yakkha, Ghoul, Gaki, Arahabaki, Onamuchi, Parvati, Kushinada-Hime, Cockatrice, Ganga
7	Will O'Wisp, Shikigami, Kumbhanda, Flauros, Forneus, Arachne
6	Fuki, Yuki Jyorou, Yomotsu-Shikome, Artemis
5	Shadow, Phantom, Black Ooze, Blob, Slime, Yaksa, Vetala, Legion, Pisaca, Choronzon, Coatlicue, Ose, Decarabia, Eligor, Andras, Dakini, Atropos, Yaksni, Lamia, Leanan Sidhe, Gorgon, Taraka, Acheri, Datsue-Ba, Take-Minakata, Kikuri-Hime, Vasuki, Kingu, Nidhoggr, Typhon, Basilisk, Koumokuten, Ares, Moloch, King Frost
4	Kinki, Karasu-Tengu, Koppa-Tengu, Kudlak Poltergeist, Quetzalcoatl, Qing-Long, Gomory, Orobas, Berith, Okuninushi, Kali, Bishamonten, Jikokuten, Zouchouten, Dionysus, Indrajit, Surt
3	Specter, Ananta, Rangda, Lachesis, Clotho, Isis, Skadi, Susano-o, Kartikeya, Mara, Mara (Amorphous), Chi You, Tzitzimitl, Loki
2	Ongyo-Ki, Shiki-Ouji, Azazel, Ishtar, Beelzebub (Human), Astaroth, Hecate
1	Shiva, Wu Kong, Beelzebub (Fly)