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Xill ‘Scourge of the Ethereal Plane’

AI Generated Artwork – NightCafe Creator

This flame-red humanoid appears to be a strange mix of insect and reptile, with four arms and twitching, fanged mandibles.

Xill 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.

Xill Leader

Family: Xill

Large aberration, lawful evil

Armor Class 16 (natural armor)
Hit Points 127 (15d10 + 45)
Speed 40 ft.

18 (+4)17 (+3)16 (+3)15 (+2)12 (+1)11 (+0)

Skills Acrobatics +6, Arcana +5, Athletics +7, Insight +4, Stealth +6
Senses darkvision 60 ft., passive Perception 11
Languages Common, Infernal
Challenge 7 (2,900 XP)

Special Traits

  • Implant. The xill leader can use an action to implant up to 7 (2d6) xill eggs in one unconscious or incapacitated creature within 5 feet of it. The xill’s eggs hatch when the target takes its next long rest, at which point the young consume the host from within. After each long rest, the target must make a DC 15 Constitution saving throw. On a failed saving throw, the target gains one level of exhaustion. Xill eggs can be removed individually by the target or another creature by making a successful DC 15 Wisdom (Medicine) check. Each check deals 1d8 slashing damage to the target. The eggs can be destroyed by magic such as lesser restoration.


  • Multiattack. The xill leader makes one Bite attack, two Shortsword attacks, and two Claw attacks.
  • ShortswordsMelee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage.
  • BiteMelee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) piercing damage, and the target must make a DC 14 Constitution saving throw or be paralyzed for 1 minute. A paralyzed creature can repeat the saving throw at the end of each of its turns, ending the effect on a success.
  • ClawsMelee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.
  • LongbowRanged Weapon Attack: +7 to hit, range 150/ft., one target. Hit: 8 (1d8 + 4) piercing damage.
  • Etherealness. The xill magically enters the Ethereal Plane from the Material Plane, or vice versa.

Section 15: Copyright Notice

City of Brass ©2018 Frog God Games; Authors: Casey Christofferson and Scott Greene

Xill CR 6

XP 2,400
LE Medium outsider (evil, extraplanar)
Init +8; Senses darkvision 60 ft.; Perception +13


AC 21, touch 14, flat-footed 17 (+4 Dex, +5 natural, +2 shield)
hp 67 (9d10+18)
Fort +8, Ref +10, Will +6
SR 17


Speed 40 ft.
Melee short swords +13/+13/+8 (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, DC 16)


Str 17, Dex 18, Con 14, Int 15, Wis 12, Cha 11
Base Atk +9; CMB +12 (+16 grapple); CMD 26
Feats Combat Reflexes, Improved Initiative, Iron Will, Weapon Focus (claw, short sword)
Skills Acrobatics +16, Bluff +12, Intimidate +12, Knowledge (arcana) +14, Knowledge (planes) +14, Perception +13, Sense Motive +13, Stealth +14
Languages Common, Infernal
SQ multiweapon mastery, planewalk


Implant (Ex)

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 (or similar effect) 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.

Multiweapon Mastery (Ex)

A xill never takes penalties to an attack roll when fighting with multiple weapons and treats claws as primary attacks even when also wielding weapons.

Planewalk (Ex)

A xill can shift from the Ethereal Plane to the Material Plane as a move action. Shifting from the Material Plane 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.


Environment any (Ethereal Plane)
Organization solitary, pair, or gang (3–6)
Treasure standard (heavy steel shield, 2 short swords, 2 longbows with 40 arrows, other treasure)

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