From LSWiki

Contents 1 Familiar 1.1 Requirements 1.2 Granted Boons 1.2.1 Attributes 1.2.2 Charms 1.2.3 Specialties 1.2.4 Other Boons 1.3 Innate Abilities 1.3.1 Psychic Talents

Familiar

 This is a female cat with dark gray fur and hazel eyes.  She seems more
 gregarious and bright than most cats.  Her eyes take in her surroundings with
 a piercing, even analytical gaze. She looks about six and a twentieth dimins long, one and
 a half dimins wide and three and a twentieth dimins tall. 

While they may seem like normal cats at first glance, they are much more. Psionic cats are incredible psychics themselves and have the potential to turn their consort into a master of the psychic talents they possess.

Requirements

They likely require arcane lore, legend lore and telepathy skill to bond to, the last of which is not trainable unless you are a psychic with an at least vaguely telepathic talent. This could very likely be wrong, however, as nobody's tried to bond to one since the Rangers-to-Verynvelyrae update.

Granted Boons

Attributes

As far as has been seen, a psionic cat consort gains bonuses to their dexterity, intelligence and charisma.

Charms

• All four standard charms.
• It is also very likely they grant Starsee.

Specialties

Bonus specialties and access granted to:

 Telepathy
 Psychokinesis
 Matrix Interface
 Psycholeptesis
 Metacreativity
 Metasenses
 Translocation
 Redaction
 Centering
 Channeling

at healthy bond +2 bonus to Telepathy Channeling

at very healthy

You are now a first-degree specialist in stealth.
You are now a second-degree specialist in matrix interface, metacreativity, metasenses, psychokinesis, psycholeptesis, redaction and translocation.

half way through deep +3 bonus to all psi skills and channeling

Other Boons

 You sense psychic energies flowing from Omoihi the Inferno's body into your mind.

When you pet a psionic cat, you obtain this buff, which is a telepathy buff among other things. Note that while you can poke your familiar to give them back the energies, be warned that they may not like being poked and may retaliate with usage of an offensive psychic ability.

Innate Abilities

Abilities the familiar may have before bonding.

Psychic Talents

All psionic cats, as far as has been recorded, are mindspeakers. Many of them possess an alarmingly large number of talents, but they are also typically very, very good at their talents, far exceeding their consorts initially and possibly in the long run. To find out what psychic talents your familiar has, the only true way is trial and error. You can monitor their SP usage through astral perception and looking at them for the more subtle talents, otherwise you'll see something like "A dark gray female cat concentrates." if they have it and can use it. However, if you're an incredibly powerful mindreader and/or a sensitive, you can try and figure out their talents through usage of your own. Bear in mind that your cat may be subject to popping a new talent at any given time.