Archives of Nethys

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Template Grafts | Universal Monster Rules


Source Alien Archive pg. 62

Hesper CR 2

XP 600
CN Medium fey
Init +1; Senses low-light vision; Perception +7


HP 21
EAC 13; KAC 12
Fort +3; Ref +3; Will +5
Defensive Abilities reactor sprite; Immunities fire, radiation
Weaknesses vulnerable to cold


Speed 30 ft.
Melee mutating touch +3 (see below)
Ranged energy ray +5 (1d3 A, C, E, or F)
Spell-Like Abilities (CL 2nd; +3 melee, +5 ranged)
1/day—jolting surge, overheat (DC 15)
At will—energy ray, mending
Constant—detect radiation


STR +0; DEX +1; CON +2; INT +0; WIS +1; CHA +4
Skills Diplomacy +12, Engineering +7, Physical Science +12
Languages Common


Environment any starship or urban
Organization solitary, pair, or clique (3–12)

Special Abilities

Mutating Touch (Su) A hesper can deliver an enormous dose of radiation with a touch, triggering sudden mutations and pain in living creatures. With a successful attack against a living creature’s KAC, a hesper causes the target to sprout tumors that erupt at the beginning of its next turn, causing a random mutation (roll 1d20 on the table below) that persists for 24 hours. An affected creature can negate this transformation with a successful DC 13 Fortitude saving throw. Once a creature has been affected by a hesper’s mutating touch, it becomes immune to that particular fey’s mutating touch for 24 hours.

Reactor Sprite (Su) If a hesper spends 1 hour in close contact with a starship’s power core or another large power source (such as a fusion reactor), it can form a long-term bond. A hesper can merge with its bonded reactor, gaining fast healing 5 while it remains merged. A merged hesper is aware of what happens in the reactor’s immediate vicinity, but if the reactor is broken or suffers the wrecked critical damage condition, the hesper is immediately expelled and takes 3d6 damage. If the reactor is destroyed while the hesper is merged with it, the hesper is slain instantly (Fortitude DC 15 negates). A hesper can bond with only one reactor at a time, and forming a new bond severs its previous bond.

Mutating Touch

1Additional eyesTarget gains light blindness and a +4 bonus to sight-based Perception checks
2–3Autonomous parasiteTarget takes 1d6 slashing damage as a parasite emerges
4–5Bioelectric cellsTechnological items held by the target gain the broken condition for as long as the target holds them
6–7Claws, spines, or teeth on one limbTarget gains a natural melee attack that deals 1d3+Str piercing damage for Medium creatures, but it takes a –2 penalty to attacks with two-handed weapons
8–9Glowing tumorsTarget sheds light as a lantern and takes a –5 penalty to Stealth checks
10GillsTarget gains the amphibious ability, but takes a –2 penalty to Fortitude saving throws
11HypertrichosisTarget gains a +1 bonus to its AC, but the max Dex bonus of armor it wears decreases by 1
12–13Musk glandTarget gains a 30-foot aura that nauseates living creatures within it (Fortitude DC = 10 + half the target’s level or CR + the target’s Con modifier)
14–15Secondary earsTarget gains vulnerability to sonic damage and a +4 bonus to hearing-based Perception checks
16–17Vestigial limbTarget grows a useless extra limb that imparts a –2 penalty to Dexterity-based skill checks
18–19Weeping soresTarget takes a –2 penalty to Charisma-based skill checks
20Wracking painTarget is sickened


Lithe and handsome, hespers embody the potential for change inherent in technological power sources. They are energetic and excitable, interested in new faces, sights, and sensations, which drives them to spread across the universe. However, hespers are invested in change for change’s sake. Though rarely malicious, they worm their way into any repository of advanced technology, rebuilding devices and asking endless questions. Most line their nests with all sorts of souvenirs— most of them stolen—which they occasionally rebuild into bizarre and sometimes radioactive totems.

Hespers stand 4 to 5 feet tall but are deceptively dense, weighing 300 to 400 pounds despite their slim, generally masculine builds. Their hair color changes from day to day, running the gamut of the colors of the humanoids around them, and their flesh glows softly in the dark. Though they’re not dangerously radioactive unless they wish to be, their presence excites the air around them, creating drifting motes of light. A hesper can focus this energy at will to project rays of fire, emit arcs of electricity, or overload electronic devices. This same energy can infuse other living creatures with focused doses of radiation, skipping the normal radiation sickness and instead causing short-lived changes to a victim’s genetic structure.

Once vanishingly rare, hespers have become somewhat commonplace as more civilizations have taken to the stars. The glowing fey are especially at home in starships, bonding to the vessels’ reactors. They can be blessings for some ships, serving as constant attendants for one of a starship’s most crucial systems, but their fickle nature also means they grow bored with regular routes or overlong stays in port, and they create drama to amuse themselves.

These nuclear fey have few common traditions, instead adopting the customs of whatever societies they dwell within. Most of their knowledge is instinctual, rounded out by boundless curiosity. Though hespers don’t typically seek out their own kind, large installations and radioactive waste facilities can host small circles of the fey. Notoriously shameless flirts, hespers often keep mortal lovers who protect or provide for them. A hesper reproduces by triggering the growth of a grotesque exowomb on a willing lover, which expands for 1–2 weeks before spilling forth a small but fully matured hesper.