Hit Dice: 5d8+25 (47 hp)
Speed: 10 ft., swim 40 ft.
AC: 18 (-2 size, +1 Dex, +9 natural), touch 9, flat-footed 17
Attacks: 7 tentacle rakes +7 melee
Damage: Tentacle rake 1d4+6
Face/Reach: 15 ft. /10 ft.
Special Attacks: Bite, improved grab
Special Qualities: Acid immunity, blindsense 120 ft.
Saves: Fort +6, Ref +2, Will +4
Abilities: Str 22, Dex 13, Con 20, Int 1, Wis 11, Cha 8
Skills: Listen +6, Spot +6, Swim +14
Feats: Alertness, Improved Critical (bite)
Climate/Terrain: Any underground
Organization: Solitary, pair or school (3-8)
Challenge Rating: 5
Alignment: Always neutral
Advancement: 6-15 HD (Huge)
Level Adjustment: -
The wyste (pronounced "wist") is an alien creature much like a giant worm that inhabits fetid pools of alien slime.
A typical specimen is 2 feet in diameter and 25 feet long. A wyste’s skin is translucent, showing strange, twisted strands of pulsing organs underneath. The creature has no face, just a large sucker hole fringed by long, claw-tipped tentacles. The tentacles allow the wyste to feed and defend itself, and they also serve as sensory organs.
So far as is known, a wyste operates only by instinct and lives to feed.
A wyste lunges up to 15 feet out of its slimy pools to attack creatures that approach. Wystes in an area often attack as a group; others nearby might be attracted by the commotion, too. When a wyste kills a victim, it drags its prey away to be consumed at leisure.
Bite (Ex): When a wyste grapples an opponent, its tentacles draw the victim to its toothed sucker hole. On the round after the wyste grabs, it makes a regular attack with its bite (in lieu of any claw attacks), gaining a +4 bonus on the attack roll (+11 melee). If the bite attack misses, the wyste drops the character, which falls prone in front of the creature. If the bite attack is successful, the victim takes 1d6+9 points of damage. The wyste can then deal bite damage automatically every round. The victim can escape by winning an opposed grapple check against the wyste, making a successful Escape Artist check against the wyste’s grapple check result, or by killing the wyste.
Blindsense (Ex): A wyste is blind, but its tentacles are sensory organs that can ascertain prey by scent and vibration. This ability enables it to discern objects and creatures within 120 feet. A wyste usually does not need to make Spot or Listen checks to notice creatures within range of its blindsense.
Improved Grab (Ex): If a wyste hits a Large or smaller opponent with one or more tentacle attacks, it deals normal damage and attempts to start a grapple as a free action without provoking an attack of opportunity (grapple bonus +17, plus a +2 bonus for each tentacle that hit beyond the first). The wyste can make only one grapple attack per round, no matter how many tentacles it devotes to the effort. If it gets a hold, it has the option to conduct the grapple normally, or simply use its tentacles to hold the opponent (-20 penalty on grapple check, but the wyste is not considered grappled). In either case, each successful grapple check it makes during successive rounds automatically deals damage for all the tentacles used to hold the opponent.