Felder's prism that negates anti-magic fields for the wielder
The Blackgate Prism is a small, triangular prism that is almost jet black. It has small runes carved into each facing. The wielder is able to suppress anti-magic fields that he is in. The exact details are known only to Felder at the moment.
Felder designed the Blackgate Prism for three years prior to being selected as a squire. Sir White, who is known for his anti-magic field research, required Felder to create the Blackgate Prism before he would consider taking Felder on as his apprentice.
Felder wears it on a black glove, where it stays floating an inch over the back of his hand.