Xill (CR 6)
Medium outsider
Init 18; Senses darkvision; Notice 23
Defense
AC 21, flat-footed 17; SR 14
(+4 Dex, +5 natural, +2 shield)
HP 67 (9d10+18)
Fort +5, Ref +8, Will +9; ACP -2
Offense
Speed 40 ft.
Melee 2 short swords +13 (1d6+3/19–20), claw +13 (1d4+3 plus grab), bite +7 (1d3+1 plus paralysis), or 4 claws +13 (1d4+3 plus grab), bite +12 (1d3+3 plus paralysis)
Ranged 2 longbows +13 (1d8/×3)
Special Attacks implant, paralysis (1d4 hours, F-DC 16)
Statistics
Str 17, Dex 18, Con 14, Int 15, Wis 12, Cha 11
Base Atk +9; CMB +12; CMD 26
Combat Maneuvers +4 grapple1 (+2 per additional set of arms used)
Feats Combat Reflexes, Improved Initiative, Iron Will, Weapon Focus (claw, short sword)
Skills Acrobatics +14, Deception +9, Intimidate +12, Knowledge (arcana) +11, Knowledge (planes) +11, Perception +13, Sense Motive +13, Stealth +14; ACP -2
Languages Common, Infernal, Xill
SQ multiweapon mastery, planewalk
Ecology
Environment Realms Between (Ethereal Plane)
Organization solitary, pair, or gang (3–6)
Treasure Value heavy steel shield, 2 short swords, 2 longbows with 40 arrows, 1808 gp
Special Abilities
Implant (Ex; disease) As a standard action, a xill can lay 2d6 eggs in a helpless creature. A xill’s eggs hatch in 24 hours, at which point the young consume the host from within, inflicting 1 point of Con damage per hour per young until the host dies. The young then emerge and planewalk to the Ethereal Plane, if possible, to mature. A remove disease spell rids a victim of all implanted eggs or active young, or they can be cut out one at a time with DC 20 Heal checks (each attempt takes 10 minutes). If a check fails, the healer can try again, but each attempt (successful or not) deals 1d4 points of damage to the patient.
Planewalk (Ex) A xill can shift from the Ethereal Plane to Porphyra as a move action. Shifting from Porphyra to the Ethereal Plane takes 2 consecutive full-round actions, during which time the xill is immobile. As a xill fades away, it becomes harder to hit: opponents have a 20% miss chance in the first round and a 50% miss chance in the second. A xill can take a single willing or helpless creature with it when it switches planes.
Xills are the scourge of the Ethereal Plane, conquering everything in their paths with only one purpose: to perpetuate their race at the expense of others. All xills are female and capable of fertilizing their own eggs, but require living hosts to incubate these eggs, which they inject into paralyzed victims by means of a grotesque ovipositor normally kept retracted behind their mandibles. Evil and alien, the plane-shifting xills possess impressive intelligence and a totalitarian, militaristic culture all their own. Though they see most other life forms as incubators, they particularly prize phase spiders for this purpose.