Blue Mana is one of two ammunition types used by Hexen weapons. All slot two weapons use blue mana, and slot four weapons use both green and blue types. Picking up a blue mana crystal provides 15 mana (or 22 on the lowest skill level). Also, if the player picks up a slot two weapon that he already has, he will gain 25 blue mana. The symbol on blue mana crystals is the Katakana character ス (su) flipped vertically.