Dnd Prompt - Tumblr Posts

Dnd prompt!

A magical item which everyone can use, BUT! it will work properly if you know how it works. It's just a box, with one big button and sigils on every side. This item is basically wizard's spell book, but instead of chance of each spell failing, the cube itself has a percentage (for my character it's 45%) lower which it will cast wild magic. And If someone, who doesn't know how to use it, uses it, it will cast wild magic no matter what!