Runemaster

The Runemaster (ルーンマスター) is an Emblem Heartless introduced in Kingdom Hearts II Final Mix.

Locations

 * Cavern of Remembrance

Strategy
It is unable to take damage from the front and will be blocked by the book. Since it is also immune to magic like the Bookmaster, the only way to defeat it is by attacking from behind.

Trivia

 * The Runemaster is reading the book the Japanese way, from right to left, like the Bookmaster, if the Heartless symbol is the cover