The jann (singular janni) are the weakest of the genies. Jann are formed out of all four elements and must therefore spend most of their time on the Material Plane.
Jann speak Common, one elemental language (Aquan, Auran, Ignan, or Terran) and one alignment language (Abyssal, Celestial, or Infernal).

Jann are physically strong and courageous, and do not take kindly to insult or injury. If they meet a foe they cannot defeat in a standup fight, they use flight and invisibility to regroup and maneuver to a more advantageous position.
Change Size (Sp): Twice per day, a janni can magically change a creature?s size. This works just like an enlarge person or reduce person spell (the janni chooses when using the ability), except that the ability can work on the janni. A DC 13 Fortutude save negates the effect. The save DC is Charisma-based. This is the equivalent of a 2nd-level spell.
Spell-Like Abilities: 3/day?invisibility (self only), speak with animals. Caster level 12th. Once per day a janni can create food and water (caster level 7th) and can use ethereal jaunt (caster level 12th) for 1 hour. The save DCs are Charisma-based.
Elemental Endurance (Ex): Jann can survive on the Elemental Planes of Air, Earth, Fire, or Water for up to 48 hours. Failure to return to the Material Plane before that time expires causes a janni to take 1 point of damage per additional hour spent on the elemental plane, until it dies or returns to the Material Plane.

Janni characters possess the following racial traits.

• +6 Strength, +4 Dexterity, +2 Consitution, +4 Intelligence, +4 Wisdom, +2 Charisma.
  
• Medium size.
  
• A janni?s base land speed is 30 feet. It also has a fly speed of 20 feet (perfect).
  
• Darkvision out to 60 feet.
  
• Racial Hit Dice: A janni begins with six levels of outsider, which provide 6d8 Hit Dice, a base attack bonus of +6, and base saving throw bonuses of Fort +5, Ref +5, and Will +5.
  
• Racial Skills: A janni?s outsider levels give it skill points equal to 9 x (8 + Intmodifier). Its class skills are Appraise, Concentration, Craft (any), Escape Artist, Listen, Move Silently, Ride, Sense Motive, and Spot.
  
• Racial Feats: A janni?s outsider levels give it three feats. A janni receives Improved Initiative as a bonus feat.
  
• +1 natural armor bonus.
  
• Special Attacks (see above): Change size, spell-like abilities.
  
• Special Qualities (see above): Elemental endurance, plane shift, resistance to fire 10, telepathy. 100 ft.
  
• Automatic Languages: Common. Bonus Languages: Abyssal, Aquan, Auran, Celestial, Ignan, Infernal, Terran.
  
• Favored Class: Rogue.
  
• Level adjustment +5.
  

SEE WIKIPEDIA ENTRY: Djinni

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System Reference Document -> List of Creatures (SRD)