Demon’s Crest: Stages 4, 5, 6, 7
Ian Wilkinson of R. I. P. Games

Stage 4 (IV)
Urn (REQUIRED: BUSTER): There is a wall in the first section that you can break with the buster, do it and go  into the hole and get the urn. 
Secret Stage: Drop in the tornado at the end of the wind section of the stage.
Vellum: There is a part in the secret stage where the airs lifts you up, float up to the upper left corner and get it.
Crown Talisman: Drop to the very bottom of the wind area in the secret stage and go  in the door. Break the left-most statue with the head butt and get the talisman. 
Crest of Air: Defeat Arma for the second time.
Flier: Uses its arms as a boomerang. Other than that it just tries to kill you with its body and gigantic tail. 
Claw: Defeat the Flier.

Stage 5 (V)
Health (+1) (REQUIRED: Ground Gargoyle): Break a statue when using the ground gargoyle. 
Crawler: This guy has crazy attacks. He causes the cave to collapse and 2 types of monsters two appear, one he throws at you. You need to hit him when his eyes are open in order to damage the monster.
Crest of Water: Defeat Crawler. 
Secret Stage (REQUIRED: Tidal Gargoyle): Dive into the water at the beginning of the stage. There is a wall just at the far right side of the stage. Break it and enter. 
Health (+1) (REQUIRED: Tidal Gargoyle): Secret section, the first part. 
Holothurion: Fires small eggs at you. You must hit the Holothurion in the flesh, not the shell area of its body, to damage it. He controls the water current so be careful. 
Health (+1): Defeat Holothurion. 

Stage 6 (VI)
Urn (REQUIRED: Aerial Gargoyle): Fly up at the start of the stage and you’ll come across a platform. The urn is on the platform.
Secret Stage (REQUIRED: Aerial Gargoyle): Just above the end of the first segment of the stage there is a secret floating rock with an entrance to the secret stage.
Health (+1) (REQUIRED: Buster): There is two ice doors in the secret stage. One of the doors, the left one, leads to a room. Use the buster to destroy the bricks. Destroy the vase and get the health.
Armor Talisman (REQUIRED: Ground Gargoyle): Use the ground gargoyle to break an ice-covered statue in the part of the secret stage just after you battle Flier. 
Crest of Time: Defeat Arma for the third time.
Vellum (REQUIRED: Ground Gargoyle): There is a ledge at the end of the second segment of this stage. You don’t need the Aerial Gargoyle to reach it, but it is easier if you have it. Break the statue with the ground gargoyle.  
Grewon: He pounces and he shoots harmful smoke at you. He is vulnerable as long as he hasn’t changed color (he does this after he gets shot). 
Demon Fire: Defeat Grewon.

Stage 7 
Health (+1): Head butt the first bell you come across. It will move back and forward and then drop a health for you.
Fang Talisman (Aerial Gargoyle): In the windy spike segment, just before it ends, there is a fake ground. Jump down the ground and you’ll enter a small room that contains the Fang Talisman. You’ll need the Aerial Gargoyle to fly out. 
Phalanx 1: He attacks you with a basic swoop attack you have seen many times before and a plasma ball attack. He is vulnerable to your shot, so no worries.
Phalanx 2: Same thing, except now there is water to play with. Turn into the Tidal Gargoyle and have a swim. 
Phalanx 3: No water, he has two new attacks. A harmless tornado attack that just gets you stuck and a tractor beam plasma ball attack. Both just get you stuck and don’t harm you. 
Phalanx 4: Let him kill you once, so that you’ll start with full health. You can only damage him by hitting him in his face, which is a pain altogether since it is high up. So jump off the stones and hover in front of his face and unleash as many shots as you can each time he reveals his face to you. Watch out for his intelligent plasma balls, lazer beam and electric attack. I suggest you have at least 1 ginseng refill and be set to the fang talisman and the best gargoyle you have.