Psionicists can choose to be in one of five concentrations at any given time. Pscionicist concentrations are: Astral Form, Phrenic Range, Thought Thief, Cerebral Bastion and Greater Astral Form. Each concentration has a specific benefit.
List of Psionicist concentrations
Crowd control
The Psionicist is the best crowd control class in Vanguard. The Psionicist has three main forms of crowd control: Charm, Mesmerizing, and Simulacrum.
Charm
Psionicists can charm Mobs, not only taking them out of the fight, but forcing them to fight on behalf of the psionicist, thus giving the psionicist a temporary pet. Only one mob may be charmed at any given time.
There are 2 lines of Psionicist charm spells.
Suggestion: This spell can only be cast on the same mob once and its duration is limited to 20-30 seconds. This is more of an emergency spell where a mob can be shut down quickly due to this spell's quick one second cast time.
Enthrall: There are three ranks of Enthrall where the charm has a maximum length of 3, 5 and 7 minutes.  This spell can be cast an unlimited number of times. When the spell is about to break you will get a message in your chat box that your charm is about to break.
Mesmerizing
"Mezzing" a mob simply means putting it to sleep. It will not be able to attack, cast or engage in battle. If the mob is attacked the mezz will be broken. Mobs that are mezzed will appear faded. There are two types of psionicist mezzes.
Time Trick: Single target 45 second "mezz." This spell can be repeatedly cast on the same target and only one mob may be under the influence of Time Trick at one time. When Time Trick breaks the enemy will have short debuff that slows movement and attack speed.
Time Stop: This spell mesmerizes all enemy targets within 10 meters for 6 seconds. The highest level version of this spell lasts 10 seconds.
Simulacrum
This is a clone spell which produces a duplicate of the target, attacking the enemy but doing no damage.  The clone distracts the mob while your group fights other enemies. Each time the enemy attacks the clone it has to see through the illusion and dispel the clone.
Gestalts
Psionicists gain new skills and abilities not only by visiting their trainer but by finding relics, called Gestalts, scattered across the world of Telon. Psionicist trainers will notify you when you are ready to learn a new ability from a gestalt and they will mark the location on your map. Presently psionicists can learn all their concentrations at gestalts along with the following spells: Telekentic Blast, Corporeal Hammer, Resurgence, Mass Expansive Mind and Mass Amnesia.
Global chat
Psionicists can enter into a special global chat with other Psionicists when using a special Union of Thought ability. There is no other global chat in Vanguard other than that for Psionicists.
Types of spells
Damage Spells
While psionicists excel at crowd controls and have many useful utility spells, they can also adequately fill the role of damage dealer. Pscionicists have very powerful damage over time spells (DoTs) along with potent direct damage spells and area of attack spells.
Mindspy
Psionicists will be able to read enemy minds and rumor has it that they can gain special temporary abilities to fight against monsters.
Buffs
Psionicists are the best power (mana) regeneration buffer class and they have the ability to heal other players' energy bars. Psionicists have lots of other buffs including increased resistances, attribute increases and more.