There is a Legacy version
here.
Aeon Stone
Item 4+Uncommon Invested Magical 
Source GM Core pg. 284 2.0Usage worn;
Bulk —
Over millennia, these mysterious, intricately cut gemstones have been hoarded by mystics and fanatics hoping to discover their secrets. Despite their myriad forms and functions, these stones are purportedly all fragments of crystal tools used by otherworldly entities to construct the universe in primeval times.
When you invest one of these precisely shaped crystals, the stone orbits your head instead of being worn on your body. You can stow an
aeon stone with an Interact action, and an orbiting stone can be snatched out of the air with a successful Disarm action against you. A stowed or removed stone remains invested, but its effects are suppressed until you return it to orbit your head again.
There are various types of aeon stones, each with a different appearance and magical effect. Each aeon stone also gains a resonant power when slotted into a special magical item called a
wayfinder
Aeon Stone (Formulating)Item 4
Source Pathfinder #213: Thirst for Blood pg. 81Price 75 gp
This four-sided prism is imbued with knowledge for the construction of several objects. The stone contains the knowledge of all formulas found in a basic crafter’s book. While you have the stone
invested, you have the full knowledge of the stone’s formulas. This counts as having the formula for the purposes of
Crafting checks. While you have this knowledge, you can write the formulas down for later use, such as if you lose access to the stone. You also gain a +1 item bonus to skill checks made to
Craft while the stone is invested.
The resonant power allows you to cast
phantasmal minion as an arcane innate spell once per day.
Aeon Stone (Repairing)Item 4
Source Pathfinder #213: Thirst for Blood pg. 82Price 75 gp
This translucent, spherical stone’s center contains a multitude of sparkling, colored flecks. While you have this stone
invested, you gain a +1 item bonus to skill checks made to Craft. Additionally, when Repairing an item, you restore an additional 5 Hit Points to the item (10 Hit Points on a critical success).
The resonant power allows you to cast
mending as an arcane innate spell once per day.
Aeon Stone (Preserving)Item 5
Source GM Core pg. 284 2.0Price 150 gp
This red crystalline star covers you in a faint aura when you are subject to lingering wounds. You gain resistance 3 to
persistent damage. At the end of any turn where the persistent damage can't overcome this resistance, end that condition.
The resonant power allows you to cast
stabilize as a primal innate cantrip.
Aeon Stone (Sprouting)Item 6
Source GM Core pg. 284 2.0Price 220 gp
Encouraging the natural growth of life, this green ovoid can often be found surrounded by new seedlings. Its resonant power allows you to cast
tangle vine as a primal innate cantrip.
Activate—Flow of Life [reaction] (
concentrate,
vitality);
Frequency once per hour;
Trigger You are healed by a vitality efect or took void damage;
Effect You gain 8 temporary Hit Points that last for 1 minute.
Aeon Stone (Crescent)Item 6
Source Pathfinder #215: To Blot Out the Sun pg. 79Price 225 gp
Once holy relics, the creation of
crescent aeon stones was inspired by
Acavna, goddess of the moon and protection. The
crescent aeon stone continually sheds dim light in a 5-foot radius.
The resonant power enables you to cast
forbidding ward as a
divine innate cantrip.
Activate—Moonbeam [two-actions] (
concentrate,
divine,
holy,
light,
spirit);
Frequency once per day;
Effect The crescent aeon stone fires a blast of silvery moonlight in a 100-foot
line, dealing 4d12 spirit damage to all creatures in the area (DC 22
basic Reflex save). This is
silver damage for the purposes of weaknesses, resistances, and the like.
Aeon Stone (Smoothing)Item 7
Source GM Core pg. 284 2.0Price 310 gp
This spherical piece of silvery stone helps you ignore minor issues. You can ignore status penalties to skill checks from
clumsy,
enfeebled,
frightened,
sickened, and
stupefied conditions as long as the value of that condition is 1. Its resonant power allows you to cast
guidance as an occult innate cantrip.
Aeon Stone (Vital amplification)Item 7
Source Pathfinder #215: To Blot Out the Sun pg. 79Price 330 gp
A
vital amplification aeon stone improves the flow of vital energy through your body, speeding the healing process and safeguarding your body from life-draining effects. Whenever you regain Hit Points, you regain an additional 1 Hit Point for each 10 Hit Points regained (minimum 1 additional Hit Point). The resonant power grants you
resistance 5 to void damage.
Aeon Stone (Flickering)Item 11
Source Pathfinder #215: To Blot Out the Sun pg. 79Price 1,200 gp
A
flickering aeon stone contains a drop of orichalcum at its center. It remains slightly out of phase with reality, giving it a translucent appearance.
Activate—Flicker [one-action] Frequency once per day;
Effect The
flickering aeon stone draws you slightly out of sync with the flow of time, causing you to flicker in and out of existence. You become
concealed for 1 minute, but you can’t use this concealment to
Hide or
Sneak.
Activate—Enter Stasis [one-action] Frequency once per day;
Effect The
flickering aeon stone pulls you from the flow of time completely, placing you in temporary stasis while you heal, then returning you to reality at the moment you left. You regain 2d10+8 Hit Points. If you have the
clumsy,
drained,
enfeebled, or
stupefied condition, the value of each of these conditions is reduced by 1.
The resonant power grants you a +1 circumstance bonus to initiative rolls.
Aeon Stone (Peering)Item 16
Source GM Core pg. 284 2.0Price 9,500 gp
This faintly colored prism catches and transforms light. If the
aeon stone is in an area of bright light, shades of purple light provide dim light in a 30-foot radius. In that radius, magical items and effects are tinged with purple, the depth of the color revealing their
counteract rank.
The GM also secretly rolls a counteract check against any darkness or illusion effect the light touches. It has a counteract modifier of +25. If the light fails to counteract an effect, it won't try again for 24 hours.
Inside a
wayfinder, the aeon stone cannot catch light. However, its resonant power lets you activate or deactivate the aeon stone's light emitting from the
wayfinder as an Interact action.