Otogi: Myth of Demons Cheats

I found a quick way to Kill the Omni Stone Demon on one of the soul cord
levels.
When you are in the final room with the demon
wait until it is fully up then shoot a ranged spell at it a couple of
times. After about 3 spell casts (which hardly does damage but slows it
down) double jump then dash until you are right above it. Start hacking
away with your fast attack (if you use your heavy attack you'll fall
right through him and into the void were you will die). You might have
to dash back and fourth a couple of times but this will surley be a
quicker way to kill it.

Kill the Hydra in level 25 to unlock the Orchid Malevolence.

Unlock Magic
House of Soryu Level 1: Dropped after killing one of the Staff Ravens in Forbidden Mansion (Stage 2).
House of Soryu Level 3: Beat Golem's Ravine (Stage 19) in under 2 minutes.
House of Suzaku Level 2: Found in Eternal Night (Stage 17) near the gate at the top of the cliff at the beginning of the stage.
House of Soryu Level 3: Beat Lair of Fire (Stage 22) with a time of 1:39 or better.
House of Byakko Level 1: Found in the well at the end of the initial pathway in Ancient Captial (Stage 4).
House of Byakko Level 3: Beat Inner Sanctum (Stage 20) with a time of 1:39 or better.
House of Genbu Level 2: Found in one of the brazier's near the row of columns set into the cliffside in Sea of fire (Stage 15).
House of Genbu Level 3: Beat Canyon of Death (Stage 23) with a time of 1:39 or better.
Unlock Weapons
Training Sword: Perform a 400-hit combo in Sprit Wood (Stage 11). It's possible, check out the walkthrough to see how.
Punisher: Found at the base of the hill to the right (where you meet the boss) in A Clouded Moon (Stage 6).
Sword of Voracity: Kill 60 enemies in Stage 26, Valley of Prayer
Thunder: Found in Stage 22, Lair of Fire, underneath the bridge between the center island and the large statue.
Golden Dragon: Found in the narrow passage near the beginning of Inner Sanctum (Stage 20).
Holy Staff: Beat Sea of Fire (Stage 15) with a time of 2:47 or better.
Dragon Point: Kill 30 enemies in Restless Sea (Stage 7).
Ogre's Horn: Defeat the Blaze Ogre near the beginning of Darkfire Cave (Stage 18).
Staff of Duality: Found in Forest of Wind (Stage 24). Look for the small passageway inside the tree stump. On the other side, the Staff rests above the entrance, on top of the stump.
Dragon Staff: Finish Palace of Gold (Stage 5) with a time of 3:20 or better.
Butterfly Staff: Destroy the plants on the left side near the beginning of The Green Cave (Stage 10). One hides a secret hallway where the Butterfly Staff can be found.
Black Swallow: Found behind the start point of Canyon of Death (Stage 23). Once the stage begins, turn around and head into the alcove. Kill the Death Serpent waiting for you to earn the Black Swallow.
Jaws of Mountain: Found in Spirit Wood (Stage 11). Follow the narrow path to the right of the start point and cross the bridge to receive your prize.
Rune Scimitars: Perform a 20-hit combo (or greater) in Mountain Gates (Stage 3).
Moonlight Sword: Free 100% of all souls in first 28... 

Moonlight Sword: Free all souls in first 28 stages.
Orchid Malevolence: Kill the Hydra in stage 25.

Magic that opposes one another do double damage and magic from the same house does half damage.
Byakko (Chimera) opposes Soryu (Dragon)
Genbu (Butterfly) opposes Suzaku (Phoenix)

Moonlight Sword: Free all souls in first 28 stages.
Orchid Malevolence: Kill the Hydra in stage 25.