This can be explained further by giving you an example. Imagine you have Ghost that is ranked 500, when equipping that ghost in the Misc. slot you will be given an +6 in every bonus. This means the ghost will give you a +6 Melee Attack Bonus, +6 Archery Attack Bonus, +6 Magic Attack Bonus, +6 Melee Defense Bonus, +6 Archery Defense Bonus, and a+6 Magic Defense Bonus.