Phase Spider (GEP)

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Sometimes confused with neogi or driders and called planar spiders on some worlds of the Prime, phase spiders are intelligent web-spinners with a raised thorax and a humanlike head. What really makes phase spiders stand out is their enviable ability to phase back and forth between a plane and the plane's Border.
Unknown to most creatures, phase spiders possess large web habitats on the Ethereal (both in the Deep and on the Border) and only appear on other planes while hunting for food. Some phase spiders do live mostly on material planes, but these spiders are the exception, not the rule. Like many more familiar cultures, Ethereally-based phase spiders are not a cohesive race, but instead exist in separate clutches (tribes), each of which claims various Prime territories as its sole hunting ground. Sometimes disparate phase spider clutches cooperate, but sometimes they come into conflict over territorial disputes.
Phase spider habitats in the Deep are fabricated from the spinnerets of the rare and gifted few that have the ability to spin out weblike strands of stable ether. (Most phase spiders spin out strands of weblike quintessential ether, which disintegrates in 1d100 hours.) Stable webs are not only useful for phase spiders building their own structures, but such webbing is also an indispensable trade item with other dwellers of the Ethereal. See "Ommiad's Web" on page 89 for an example of a phase spider habitat in the Deep Ethereal.
When hunting prey on other planes, phase spiders materialize, attack from behind, and become ethereal again all in a single round. If the prey proves too difficult, a phase spider retreats back to its home turf to choose victims more amenable to attack. If the unthinkable happens and feisty prey follows a spider back onto the Border Ethereal, a crafty spider reverses its earlier tactics and launches attacks from the plane upon those who now menace it on the Border. (MONSTROUS MANUAL) 
PHASE SPIDER: AC 7 {7}; MV 6, Wb 15 {6, Wb 15}; HD 5+5; THAC0 15; #AT 1; Dmg 1d6 + poison (bite); SA Phase, poison; SZ H (14' diameter); ML champion (15); Int low (5-7); AL N; XP 1,400.
SA-Phase: Can shift between a plane and the Border at will. Phase spiders materialize, attack from behind with a +4 bonus, and become ethereal again all in a single round, granting the hunter a -3 bonus on initiative rolls. If a phase spider wins initiative by more than 4 steps, the attack is too swift to be answered. Poison: Victims bitten must save vs. poison (type Fl at a -2 penalty or die.