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There is a Legacy version here.

Bythos

The bythos is a guardian of space and time and ever seeks those who misuse planar and temporal magic. A bythos is a roughly humanoid creature with four arms and a body made of swirling clouds and mist. Despite their appearance, their body feels like dry stone. A bythos seeks out paradoxes caused by irresponsible planar or dimensional travelers and repairs breaches where the barriers between planes have become thin or damaged. If the mortals responsible remain in the area and cannot be convinced to cease their activities, the bythos has no qualms about removing them. Using their ability to manipulate time, a bythos might cause an opponent to quickly die of old age as time speeds up around them or cause a target to disappear from time and space.

Recall Knowledge - Monitor (Religion): DC 37
Unspecific Lore: DC 35
Specific Lore: DC 32

Elite | Normal | Weak
Proficiency without Level

BythosCreature 16

Uncommon Large Aeon Monitor 
Source Monster Core 2 pg. 12
Perception +30; darkvision
Languages envisioning
Skills Arcana +29, Athletics +32, Deception +25, Intimidation +25, Nature +30, Occultism +29, Religion +30, Stealth +26
Str +8, Dex +4, Con +5, Int +7, Wis +8, Cha +5
Envisioning When a bythos conveys information, it does so wordlessly through psychic projections. This acts as telepathy with a range of 100 feet but is understandable to all creatures regardless of whether they have a language. The meaning to non-aeons can be vague and is often mysterious. A bythos can use this ability to communicate flawlessly with any other aeon on the same plane.
AC 39; Fort +25, Ref +26, Will +30; +1 status to all saves vs. magic
HP 245, regeneration 15 (deactivated by spirit); Weaknesses spirit 15
Confusing Gaze (aura, divine, emotion, incapacitation, mental, visual) 30 feet. A creature that ends its turn in the aura must attempt a DC 34 Will save. If it fails, it's confused for 1 round (or 1d4 rounds on a critical failure).Temporal Reversion [free-action] (fortune) Trigger The bythos fails or critically fails a check; Frequency once per day; Effect The bythos rerolls the triggering check and takes the better result.
Speed fly 35 feet
Melee [one-action] fist +32 [+27/+22] (magical, reach 10 feet), Damage 3d8+16 bludgeoning plus 2d8 coldDivine Innate Spells DC 37; 8th augury (at will), teleport; 7th haste, interplanar teleport, planar seal, planar tether; 6th slow; 4th planar tether (at will)
Aging Strikes [two-actions] (divine) The bythos make two fist Strikes against a single target. If both Strikes hit, the target attempts a DC 37 Fortitude save. Creatures that don't get weaker with age or don't age are immune (GM's discretion). If a creature becomes clumsy 4, drained 4, and enfeebled 4 due to Aging Strikes, it dies of old age.
Success The creature is unaffected.
Failure The creature becomes clumsy 1, drained 1, and enfeebled 1, or increases each of these conditions by 1. This effect is cumulative with other Aging Strikes from bythoses, to a maximum of clumsy 4, drained 4, and enfeebled 4.
Critical Failure As failure, but the creature becomes clumsy 2, drained 2, and enfeebled 2, or increases these conditions by 2.
Focused Gaze [one-action] (concentrate) The bythos focuses their gaze on a creature they can see within 30 feet. The target must attempt a save against the bythos's confusing gaze. A bythos can't use this ability against the same creature more than once per turn.Temporal Flurry [two-actions] The bythos makes four fist Strikes. Their multiple attack penalty increases normally with each attack.Temporal Strike [two-actions] (divine, incapacitation, teleportation) The bythos touches a creature or object to displace it from time. The target attempts a DC 37 Fortitude save.
Critical Success The target is unaffected.
Success Time flows around the target; the target is slowed 1 for 1 round.
Failure The target disappears from the present moment and reappears in the same location 1d4 rounds later as if no time had passed for it. If a creature or object occupies that space when the target returns, the target appears in the closest available space to its original location.
Critical Failure As failure, but the target is slowed 1 for an extra 1d4 rounds after it returns.

Sidebar - Related Creatures Guardians Of Time

Bythos aeons have no innate ability to directly enter the mysterious Dimension of Time, but many know of the hidden routes in the Great Beyond one can use to travel to this strange realm. A bythos prefers to destroy those who seek entrance to the Dimension of Time rather than risk the knowledge of how to reach it spreading too far.

All Monsters in "Aeon"

NameLevel
Akhana12
Arbiter1
Axiomite8
Bythos16
Kolyarut12
Marut15
Pleroma20
Theletos7
Venator13
Vigilia11
Zelekhut9

Aeon

Source Monster Core pg. 8 1.1
Aeons have always been the caretakers of reality and defenders of the natural order of balance. Each type of aeon takes on some form of duality in its manifestation and works either to shape the multiverse within the aspects of this duality in some way, or to correct imbalances to the perfect order of existence. Aeons' machinations can raise a nation, raze it, or restore it from ruin. Their reasons are their own, and they rarely share their motivations with others—through their strange envisioning mode of communication, they simply create the results they insist are necessary to maintain the balance of the multiverse.

As a result of recent shifts in reality, aeons have begun to reassert a presence in the perfect planar city of Axis. To aeons, this is merely the latest in a recurring cycle, albeit one that mortals have not yet borne witness to. Aeons have a name for this cyclic return, in which they welcome their industrious axiomite brethren back to their fold: the Convergence. At the onset of the Convergence, a council of pleroma aeons appeared in the Eternal City of Axis, where they revealed that axiomites were wayward aeons, split off long ago to pursue the act of creation. With the latest cycle of change, it was time for axiomites—and their mortal creations and kin—to rejoin the aeon cause. While most axiomites fell in line, realizing perhaps on a fundamental level of reality that what the aeons said was the truth, some refused to heed the call and waited for the wrath of the aeons. That wrath has yet to come. The dual-natured aeons have responded to those who have declined in confusing ways. With some they treat and even bargain, while a handful of others they have destroyed, and a few have been exterminated by the axiomites. But most of these quiet insurgents they leave alone, allowing these axiomites to continue to create in peace. How—or if—this Convergence will end is as little understood as aeons themselves.

Sidebar - Additional Lore Aeon Divinities

Whether the aeons serve an actual divinity, a philosophical concept, or merely a “supreme oneness” is a topic hotly debated by planar scholars. The aeons themselves are silent, referring to this being or concept as the Monad, a “condition of all.” Regardless of what the Monad actually is, there certainly exists another category of powerful aeons—the Arbiters, each a unique demigod with its own powers and goals.

Sidebar - Related Creatures Axiomite Constructs

Axiomites build a dizzying array of constructs, each dedicated to a single role in the planar city of Axis, from carrying packages to ferreting out spies. Only a few models are frequently sent outside of the city, although the great legions of specialized soldiers being constructed make observers worry that won’t last.

Sidebar - Additional Lore Other Aeons

Aeons are among the least understood of the Great Beyond's immortal creatures, and they have a wide range of powers and abilities. Far more aeons exist than those presented here, including guardians of time like the four-armed bythos and the weirdly symmetrical theletos, which moderates the duality between freedom and fate.

Sidebar - Treasure and Rewards Tools of Creation

Although records are obviously sparse, aeons were deeply involved in the creation of the Universe. A handful of intact tools from this monumental undertaking remain in the possession of planar powers, but even the broken fragments of these tools are treasured by mortals as aeon stones.