Psionic discipline: Telepathy

Telepathy powers can spy on and affect the minds of others, influencing or controlling their behavior. Most telepathy powers are mind-affecting.

Psionic Casting

At 2nd level, you gain the Psionic Casting feature. When manifesting a power (i.e. casting a spell), you ignore any verbal and somatic components, and any material components that are not both consumed by the spell and have a listed gold cost.
This allows you to ignore spellcasting limitations based on components, such as not having a hand free, having your hands bound or being gagged. However, this feature does not allow you to cast spells when you are explicitly prohibited from doing so, such as when wearing armor you are not proficient with or when you are Polymorphed.

However, unless you use any abilities to hide it (such as the Subtle Spell metamagic feature), manifesting a power (i.e. casting a spell) is still readily obvious to onlookers, as it is accompanied by a telltale auditory, material, mental, olfactory or visual display emanating from you. Auditory displays can be, for example, a strange hum or ringing; material displays could consist of a short appearance of ectoplasmic residue; mental displays, a flash of static or aura that onlookers notice around you; olfactory, the sudden appearance of a familiar scent, or a smell of burning; and visual displays often involve scintillating colours or your eyes lighting up with psionic energy.
Whatever the form, these displays are never significant enough to create immediate consequences for the psionic creatures, allies, or opponents during combat, but they do indicate the use of magic and its user. 

Typically, the nature of a display depends on the kind of spell components are being ignored: Verbal components result in an auditory or mental display, somatic components result in a visual display, and material components result in a material or olfactory display.

Any feature or effect that would allow you to ignore spell components other than this ability, also allows you to conceal the corresponding displays.

Improved Friends

When you choose this school at 2nd level, you learn the friends cantrip. If you already know this cantrip, you learn a different wizard cantrip of your choice. The cantrip doesn’t count against your number of cantrips known.

When you cast friends, the target doesn't realize that you used magic to influence its mood and becomes hostile toward you.

Subconscious Terror

At 6th level, you add the phantasmal killer spell to your spellbook, if it is not there already. You can cast phantasmal killer without expending a spell slot.

Once you cast phantasmal killer in this way, you can’t do so again until you finish a long rest, though you can still cast it normally using an available spell slot of the appropriate level.

Telepathic

At 10th level, you gain the following benefits:

• You can speak telepathically to any creature you can see within 60 feet of you. Your telepathic utterances are in a language you know, and the creature understands you only if it knows that language. Your communication doesn’t give the creature the ability to respond to you telepathically.
• You can cast the detect thoughts spell, requiring no spell slot or components, and you must finish a long rest before you can cast it this way again. Your spellcasting ability for the spell is the ability increased by this feat. If you have spell slots of 2nd level or higher, you can cast this spell with them.

Subtle Influence

At 14th level, you gain the ability to make a creature unaware of your magical influence on it. When you cast an enchantment spell to charm one or more creatures, you can alter one creature’s understanding so that it remains unaware of being charmed.

Additionally, once before the spell expires, you can use your action to try to make the chosen creature forget some of the time it spent charmed. The creature must succeed on an Intelligence saving throw against your wizard spell save DC or lose a number of hours of its memories equal to 1 + your Charisma modifier (minimum 1). You can make the creature forget less time, and the amount of time can’t exceed the duration of your enchantment spell.