The nehthalggu, or brain collector, can store up to ten humanoid brains and use them to enhance its knowledge and power. The destruction of these brains causes the brain collector to lose some of its magical power. Each brain can be attacked (AC 20: 15 hit points). Destroying a single brain deals no damage to the brain collector but causes it to lose special abilities. The number of brains determines its additional special attacks. It may use each of these abilities once per day. These abilities are psionic in nature (treat as spellcasting). Its psionic ability is Intelligence (spell save DC 15, +7 to hit with these attacks). Some options are passive and are active so long as the nehthalgaa has the appropriate number of brains. It may also maintain as many concentration spells as it has brains: 0: No additional special abilities.