Greater Fire Mephits are Elementals from the Plane of Fire. They are Neutral but aggressive, attacking on sight. They are tougher and more proficient in combat than their lesser cousins. They also possess a wider array of spells.
Being Neutral they are only subject to Bane weapons of the appropriate sub-type.
They have superior senses confering bonus's to Spot and Listen checks.
Their melee attacks have a fire damage modifier, so fire resistance is effective against them. They are also vulnerable to cold damage.