Impossibly huge, this glittering, spider-like creature emerges from a mountainside cave to walk delicately on its sparkling, jewel-like web, strung between mountains.

Crystal Mountain Spider (CR 15; XP 51,200)
N Colossal magical beast
Init +7; Senses darkvision 60 ft., tremorsense 60 ft.; Perception +21
AC 31, touch 5, flat-footed 28
(+3 Dex, +26 natural, –8 size)
hp 230 (20d10+120)
Fort +18, Ref +17, Will +9
DR 10/bludgeoning; Immune acid, petrification; SR 26
Vulnerable sonic
Speed 40 ft., climb 20 ft.
Melee bite +26 (8d6+26 plus poison)
Space 30 ft.; Reach 20 ft.
Special Attacks powerful bite, stunning sparkle +15 ranged touch, web (+16 ranged, DC 30, 20 hp)
Str 36, Dex 16, Con 22, Int 6, Wis 12, Cha 8
Base Atk +20; CMB +8; CMD 20 (32 vs. trip)
Feats Ability Focus (poison), Far Shot, Improved Initiative, Iron Will, Lightning Reflexes, Point-Blank Shot, Precise Shot, Skill Focus (Perception), Weapon Focus (bite), Weapon Focus (web)
Skills Acrobatics +10, Climb +25, Perception +21 ; Racial Modifiers +8 Climb, +4 Perception
Languages Terran (cannot speak)
SQ reflective carapace, strong webs
Environment mountains
Organization solitary
Treasure incidental
Special Abilities
Poison (Ex) Bite—injury; save Fort DC 28; frequency 1/round for 6 rounds; effect 1d4 Str, 1d4 Dex and staggered; cure 2 saves. Save DC is Constitution-based.
Powerful Bite (Ex) The crystal mountain weaver can break large boulders with its bite. It deals 8d6 points of damage on each attack plus twice its Strength modifier. The bite of the crystal mountain weaver ignores hardness and 10 points of any untyped DR or materials-based DR.
Reflective Carapace (Ex) Due to its crystalline exoskeleton, any ray or gaze attacks that do not overcome the crystal mountain weaver’s spell resistance are reflected back on the attack’s source.
Strong Webs (Ex) A crystal mountain weaver’s webs gain a +4 bonus to the DC to break or escape; their crystalline nature gives them DR 10/—.
Stunning Sparkle (Ex) When in full daylight, a crystal mountain weaver can take a full-round action to magnify the sun’s rays into a beam of blistering, stunning light up to 300 ft. that can hit a target of Medium size or larger. If it hits, the target must make a DC 26 Fortitude save or be stunned for 1d6 rounds and suffer 8d6 points of fire damage. The save is Constitution-based.

To call a crystal mountain weaver a “spider” would be a misnomer; they are likely a long-ago transplant from the elemental Plane of Earth moved to the Material for easier hunting. Indeed, these 60-foot long, 100 ton crystalline creatures are large and powerful enough to hunt, catch and eat small dragons. They prey on anything man-sized or larger, typically winged creatures such as rocs, drakes, giant birds, wyverns and the like. They will not overlook ground-dwelling prey, however, and many a bold giant has ended up cocooned and feasted upon by these awesome arachnid analogs.
Crystal mountain weavers build their sparkling webs of flexible, super-strong crystal between mountain peaks, suspended from crags, even over the mouths of caves- the sight of a busy ‘weaver leaping across a canyon like a flying castle is a once-in-a-lifetime scene. The threads of their webs are sought after for craft material by many cultures, and humanoids small enough to be beneath their notice often harvest sections of them, though it is not without risk. Being caught by a crystal mountain weaver is often seen as a judgment by the gods- indeed, these beautiful, colossal builders and hunters are often revered by mountain tribes, as much for their disposing of large predators as their awesome godlike power.
Crystal mountain weavers typically stay in large mountain cave dens, nearby strands from their web notifying them when prey is trapped or nearby. They can even sense errant currents from winged flight or vibrations from large mountain climbers through the web. Though very solitary, crystal mountain weavers mate about every decade or so, an event of great omen in their territories. Males will travel to female webs, often over large distances, and the females will produce 2d6 crystalline eggs. In very lean times the female will eat the male, which portends catastrophe for those that revere them. When the young ‘weavers hatch, early nest squabbling will leave 1d8 immature crystal mountain weavers to leave the cave; their statistics are identical to those of an ogre spider but with pale coloring. The young will mature to full size in 10 years, seeking to find a mountain peak that they can call their won, and spin their iridescent webs.

Crystal mountain weavers are found primarily in the Birdman Mountains, where intrepid halflings gather web-strands for use in many crafts. In the Reversed Lands of the north, they have been known to catch skywhales. Some specimens can be found in the Sulgu Mountains of the west, as well, where the A’Tez and I’nsian people revere them as godlike avatars, the “Ja’kal Ankabu”. A smaller subspecies (merely Gargantuan) is kept by orders of Linite priests in the southeastern Abancoi Nicn Mountains of the Clockwork Lands, favored beasts of their god.