Kokushibo Blood can be earned after defeating Kokushibo in the Infinity castle, the last mission of the Slayer Storyline. When used by a Hybrid player, gives you Kokushibo's six eyes as a cosmetic. Furthermore, this item is not droppable due to being a boss drop. (The drop rate of the Kokushibo blood dropping is 25% chance Infinity castles.)
The six eyes that are given by drinking Kokushibo's blood.
Note: This change gives no buffs and is purely cosmetic.