Large (Aberration) CR 7
HP 45, hd6d8+18 AC 17 (?1 size, +2 Dex, +6 natural), touch 11, flat-fooded 15 Fort +5, Ref +4, Will +8 Speed 30 ft. (6 squares), climb 15 ft. Initiative +2 Spot , Listen
Standard attacks BAB +4, Grapple +10
Attacks
Full attack: 2 daggers +3 melee (1d6+2/19?20, 1d6+1/19?20) and bite +1 melee (1d4+1 plus poison); or shortbow +5 ranged (1d8/x3)
Special Attacks/Qualities
Spells, spell-like abilities, poison
Darkvision 60 ft., spell resistance 17
Skills Climb +14, Concentration +9, Hide +10, Listen +9, Move Silently +12, Spot +9
Feats Combat Casting, Two-Weapon Fighting, Weapon Focus (bite)
Str 15 Con 16 Dex 15 Int 15 Wis 16 Cha 16
Alignment Always chaotic evil, Environment Underground, Organisation Solitary, pair, or troupe (1?2 plus 7?12 Medium monstrous spiders)

Driders speak Elven, Common, and Undercommon.

Driders seldom pass up an opportunity to attack other creatures, especially from ambush. They usually begin with a spell assault and often levitate out of the enemy?s reach.
Poison (Ex): Injury, Fortitude DC 16, initial and secondary damage 1d6 Str. The save DC is Consitution based.
Spell-Like Abilities: 1/day?dancing lights (DC 13), clairaudience/clairvoyance, darkness, detect good, detect law, detect magic, dispel magic, faerie fire, levitate, suggestion (DC 16). Caster level 6th. The save DCs are Charisma-based.
Spells: Driders cast spells as 6th-level clerics, wizards, or sorcerers. Drider clerics can choose from the following domains: Chaos, Destruction, Evil, and Trickery. The typical spells prepared shown here are for a drider sorcerer.
Typical Sorcerer Spells Known (6/7/6/4, base save DC 13 + spell level): 0?daze, detect magic, ghost sound, mage hand, ray of frost, read magic, resistance; 1st?mage armor, magic missile, ray of enfeeblement, silent image; 2nd? invisibility, web; 3rd?lightning bolt.
Skills: A drider has a +4 racial bonus on Hide and Move Silently checks. It has a +8 racial bonus on Climb checks and can always choose to take 10 on a Climb check, even if rushed or threatened.

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System Reference Document -> List of Creatures (SRD)