Collect all souls to unlock the chaos ring. It will appear in one of the blue rooms of the abyss. It gives the user extreme MP regeneration (practically infinite) and a stat boost.
In the left part of subterranian hell, there is a slot machine door, make sure your last 3 digits of your gold are 666, the door will slide back, and you can get the gold ring, making monsters/candle drop more money!
Beat the game with the good ending (beat Menace), after that, you can choose to start a new game + on that file in wither Normal or Hard difficulties.
Hell Fire Soul
Complete Hard Mode with Soma and you will get the Hell Fire Soul.(Dracula's Favourite Move.The Triple Fireball.)