Zhjaeve

Zhjaeve (female lawful neutral githzerai cleric, domains: Magic, Knowledge) is a joinable NPC in Neverwinter Nights 2.

"Zhjaeve is a Githzerai and therefore an enemy by birth of the Githyanki that chased you from the very beginning of the game. After you free her of her prison, she helps you with your main quest. Her thinking is very strange and alien. Her people live in the plane of Chaos and can only exist if they keep an extraordinary mental discipline; doubt can be deadly there, for example. Also, the Githzerai can create items just through thoughts on their homeplane. That is why Zhjaeve believes in you - she thinks her thought alone will make you the hero you have to be, so she casts aside every doubt and cannot be argued with. And that is just an example of her way of thinking."

Gameplay
Zhjaeve has surprisingly bad stats: Str 10, Dex 13, Con 12, Int 14, Wis 20, Cha 13, at level 14. Assuming Githzerai get the same stat boni as humans, that would be Pointbuy 35 for an initial Wis score of 17, but distributed very badly; especially her Strength score hurts. It doesnt feel as bad in actual play, as you should already have a couple of Strength items when you finally get to Zhjaeve, but she's definitely quite behind in respect to her stats.

Zhjaeve has the typical good cleric buffs, but her bad stats make the usual useage of clerics as decent fighters who only need to be buffed first much less effective. Clerics are the most defensive of all specialized spellcasters, and Zhjaeves domains don't change much about that.

All in all Elanee is a strong concurrence in pure effectivity, even if Zhjaeve might be important for story.

Crafting
Zhjaeve is like Sand obviously a character that is very focussed on crafting. Together with him, she can craft everything in the game except the Amulet of Natural Armor that require the Barkskin spell, which requires that you give Elanee or Bishop the Craft wondrous item feat. However, there are so many good Amulets around, including the craftable Amulet of Health, Medallion of Thought and for priests also Periapt of Wisdom, that many people will prefer to cast Barkskin as a buff instead.

When you craft, you will very likely want Zhjaeve to have both the Craft magical arms and armor and Craft wondrous item feats. Alternatively, you could give Qara the Craft wondrous item feat instead, as the only important item created with that would be the ones based on Mage Armor that Qara should have - unless you have removed it from her spelllist.

Craft magical arms and armor:
 * Melf's acid arrow from Zhjaeve's Magic domain allow to craft Acid Weapons with 1d6 Acid damage, the best elemental damage type after sonic which is unavailable. Sand can't cast this spell because Transmuters can't cast Conjuration spells. Qara could learn this spell.
 * Mage Armor, again from the Magic domain, allows to craft defending weapons. Again Sand can't do this because its a Conjuration spell. Qara could learn this spell, too, and initially even has done so.
 * Inflict critical wounds is required for unholy (2d6 magic damage vs good), axiomatic (2d6 magic damage vs chaotic), and anarchic (2d6 magic damage vs lawful) weapons. Zhjaeve is definitely the only companion with this spell.
 * Silence is required for crafting Silent Armor (either +5, +10 or +15 on Move Silently). Grobnar is the only other companion able to learn this spell.
 * Spell Resistance is required for Armor of Spell Resistance (either SR 14, 18, or 22). Elanee can cast this as well.

Craft woundrous item:
 * Mage Armor also allows to craft Bracers of Armor (+1 to +8) and the powerful Robe of the Archmagi.
 * Silence is also required for Boots of Elvenkind.
 * Spell Resistance is also required for Greater Mantle of Spell Resistance (SR 20).