Lets start at the top since each army gets its psychic powers a little bit differently depending on how their powers are written in their codices. Powers are exchanged.... codex powers for rulebook ones, with only a single exception.
Librarians and Mephiston (assuming lib dreads as well), can exchange their two powers for rulebook to generate powers from biomancy, divination, telepathy, or telekinesis in any combo
Chaos Space Marines
Any model with psychic powers can swap out their powers for the rulebook ones. For each power purchased in the codex, generate powers from pyromancy, telekinesis, or telepathy in any combo.
Typhus generates 2 powers
Ahriman generates 3 powers
Librarians, including Ezekiel can exchange their codex powers, generate 2 powers from the rulebook chosen from divination, pyromancy, telepathy, or telekinesis in any combo.
Farseers including Eldrad may exchange their powers for those in the rulebook for each power he has purchased from the codex, powers are from divination or telepathy.
Eldrad generates 4 new powers.
A librarian may use the disciplines in the rulebook instead of those in the codex. If so, he generates a number of powers equal to his mastery level from divination, pyromancy, or telekinesis. Hammerhand is not exchanged
Inquisitors can exchange only 1 power, same disciplines as the librarian.
Coteaz can exchange all his psychic powers for 2 rulebook ones
Primairs psyker can exchange his codex powers for 2 from the rulebook, biomancy, pyromancy, telepathy, and telekinesis in any combination.
librarians including Tigurius can use the powers in the rulebook instead of codex powers. They generate 2 powers from biomancy, pyromancy, telepathy, or telekinesis in any combo
Tigurius generates 3 powers
A rune priest including Njal can use the rulebook powers instead of codex ones. Generate 2 new powers from biomancy, divination or telekinesis
any model with psychic powers can exchange codex powers for rulebook ones. For each power including those purchased, they generate a new one from biomancy, telekinesis or telepathy
Powers from MadCowCrazy
Smite Range 12" - is a Witchfire
Iron Arm -something about Toughness
Enfeeble within 24" - suffers a -1, treats all terrain
Endurance within 24" - gains the Fe (Feel no Pain?), special rule
Life Leech Range 12" - If Life Leech, immediately, to his starting
Warp Speed - Attacks (Roll
6. Haemorrhage - Haemorrhage is a focussed witchfire power with a range of 12". The target must pass a Toughness test or suffer a Wound with no armour or cover save allowed. If the target is slain, randomly select another model (friend or foe) within 2" of him. That model must pass a Toughness test or suffer a Wound with no armour or cover saves allowed. If that model dies, continue the process until a model survives or there are no suitable targets within range.
Prescience - within 12, can reroll
Foreboding - this power is, Counter-attack, full Ballistic, this does not, Overwatch
Forewarning - within 12", a 4+ invulnerable
Endurance from Biomancy listed....
Perfect Timing - have the Ig
Precognition - Hit and To Wound
6. Scrier's Gaze - Scrier's Gaze is a blessing that targets the Psyker. Whilst the power is in effect, you can roll three dice and chose the result you want when rolling for Reserves, Outflank and mysterious terrain.
Flame Breath - Template
Fiery Form - +2 strength, Blaze special
Fire Shield - within 24"
Inferno - Range 24"
4. Spontaneous Combustion
Sunburst - Range 6
6. Molten Beam - is a beam with the following profile Range 12" S8 AP1 Assault 1, Melta
Assail - Range 18"
Crush - is a f, Roll 2D6, equal to the, automatically, automatic, of a separate
Gaze of Infinity - 24", Deep Strike
3. Objuration - a single enemy, rolls a 6, squadron)., with the H, for each).
Shockwave - Range 12"
Telekine Dome - within 12", invulnerable, power is in effect, AP equal
6. Vortex of Doom - is a witchfire power with the following profile: Range 12" S10 AP1 Heavy 1, Blast* If, when using this power, the Psyker fails his Psyhick test, centre the Vortex of Doom blast marker on the Psyker - in this case, the template does not scatter.
Psyhic Shriek - Roll 3D6, unit suffers, Armour and, caused by
Dominte - within 24", must pass a, shoot, Run, action is fo
Mental Fort(ification) - unit within, regroups
Puppet Master - of 24", as if it was, the Psyker, players control
Terrify - is a malediction, unit within, the Fearless, having the, Furthermore
Invisibility - within 24", Stealth special, gain no benefit, don't see it, Skill 1
6. Hallucination - is a malediction that targets a single enemy unit within 24". Roll immediately to determine the manner of hallucinations the target is suffering from (roll once for the whole unit).
1-2 Bugs! I Hate Bugs! Something unspeakable has gotten under the victims armour and has begun to crawl around. The unit is automatically Pinned, unless it would normally automatically pass Pinning tests or is locked in close combat, in which case there is no effect.
3-4 Ermmm? All sense of urgency is lost, and the befuddled warrior just stare listlessly into space. The unit cannot shoot, Run, declare charges or strike blows in close combat whilst the power is in effect.
5-6 You! You're a Traitor! Paranoia set in and the panicked warriors lash out at thei comrades. Every model in the unit immediately inflicts a single hit on his own unit, resolved at that model's own Strengths, but using the Strength bonuses, AP values and special rules of their most powerful close combat weapons (if they have any).