Realistic image of a open grimoire, it will be open to display the two sides,

Description for the Grim Dark Side:
On one side of the grimoire, create a dark and foreboding atmosphere. The cover should be made of aged, weathered leather, with an eerie texture resembling cracked skin. Adorn the cover with twisted thorns and spikes, forming macabre patterns that evoke a sense of dark magic. Incorporate subtle necromantic symbols, such as skeletal hands or sinister runes, to enhance the ominous feel. Use a color palette dominated by deep purples, blacks, and blood-red accents to convey the malevolent nature of this side.

Description for the Angelical and Holy Side:
On the other side of the grimoire, craft a contrasting scene of purity and divinity. The cover should be adorned with ethereal golden accents, resembling intricate patterns of filigree and angelic symbols. Integrate soft, white feathers that gracefully cascade down the cover, creating an otherworldly and celestial feel. Includ