A Seal of Shadows

A black card lies here, embossed upon it is a silver spiderweb and the word 'Iniquity'.

Identify

Object 'a Seal of Shadows' is infused with your magic...
It is a level 10 treasure, weight 1.
Special properties:  none
This treasure has a gold value of 0.

Information

• Mob: Unknown
• Area: The City of Iniquity
• Pop: No
• Manufactured: Unknown
• Out of Game: Unknown
• Minimum Level: Unknown
• Maximum Level: Unknown
• Known keywords: Unknown

Description/Exam

You hold in your hands what appears to be a playing card but it is
slightly bigger than the cards you would see at the average betting game.
On one side, in flowing silver script is the word 'Iniquity'. 
A silver spiderweb adorns the other side but it is not a drawing.
The threading of the web seems to be made of delicatly spun silver.