"

Question 4 is answered in the 2nd sentence of the paragraph you quoted. As for the others ... the text describes it like a projection formed within the minds of close friends and associates, as if you were to "hijack" their eyes for a holographic image of yourself. It is meant as a means of communicating with them, rather than directly affecting the environment. Think Obi-Wan Kenobi in TESB.

Physical attacks are obviously out of the question, but psychic attacks and powers might be possible depending on how your GM interprets it. The psyker would effectively have to "possess" the target to see and hear through their eyes, then direct their psychic power from the link they have forget to whatever target they wish to engage.

Whilst perhaps possible (it sounds like the setting should allow for such things to happen), this should certainly be a difficult feat -- starting with most humans probably having a hard time opening themselves up like this.

Errata, page 10: The Projection power on page 180 should include the addition: “A Projected Psyker may use any other Telepathy Discipline powers he possesses.”

Errata, page 10: The Projection power on page 180 should include the addition: “A Projected Psyker may use any other Telepathy Discipline powers he possesses.”

Yes, I got that too.

So, is this example is possible?

a psyker "A", uses projection to travel to his fellow friend acolyte "B" in nearby planet. Acolyte "B" accepts the projection. Psyker "A" shapes himself as a unicorn near acolite "B". Newly appeared unicorn shaped psyker "A" can be seen only by acolyte "B", psykers, warp entities. That same psyker "A" can see everything around and fly/walk as it would normally (or maybe he can be fast as a speed of a thought?). Unicorn psyker "A" cannot do psysical damage to other and nobody else can inflict damage on him. However, any psychic power can affect in both ways - psyker uses telepathy to soul kill, dominate, terrify and etc. on targets and targets can use their psychic attacks on psyker. I gues, deamons can still do damage using their claws, teeth and etc. ? So, Unicorn psyker "A" can help fellow acolyte "B" to deal with bad guys by dominating somebody and throwing grenades at comrades in trenches, even forcing to use powers such as Holocaust and others (assuming a bad guy has low corruption or insanity, luck in dice as these powers rolls have high thresholds, and again more luck). Unicorn psyker "A" sees a bad psyker, comes in range of Dominate. Having "Mental Fortress", can make baddy psyker kill himself by using psychic powers. Then Unicorn psyker "A" uses Dominate to dominate baddy psyker and finally forces him to Firestorm those around him. The day is saved, Unicorn psyker "A" says good bye and returns to his body.

[...]Having "Mental Fortress", can make baddy psyker kill himself by using psychic powers. Then Unicorn psyker "A" uses Dominate to dominate baddy psyker and finally forces him to Firestorm those around him. The day is saved, Unicorn psyker "A" says good bye and returns to his body.

How exactly do you want to use "Mental Fortress" in this example?

Apart from that, yes, that seems to be how it's supposed to work. You might want to house rule something like a sustain penalty depending on how far you are from your body. The "Ravenor" series has inquisitor Ravenor mind travel quite a lot and it mentions his power being diminished when he has to project over great (planetary) distances.

[...]Having "Mental Fortress", can make baddy psyker kill himself by using psychic powers. Then Unicorn psyker "A" uses Dominate to dominate baddy psyker and finally forces him to Firestorm those around him. The day is saved, Unicorn psyker "A" says good bye and returns to his body.

How exactly do you want to use "Mental Fortress" in this example?

Apart from that, yes, that seems to be how it's supposed to work. You might want to house rule something like a sustain penalty depending on how far you are from your body. The "Ravenor" series has inquisitor Ravenor mind travel quite a lot and it mentions his power being diminished when he has to project over great (planetary) distances.

Mental Fortress says that:

"Mental Fortres"

You are trained to aggressively resist psychic attacks. Whenever you are the target of a psychic attack, you force the psyker to make a Willpower Test. On a failure, the psyker takes 1d10 points of Damage plus 1 Damage per point of your Willpower Bonus. This Damage is considered Impact Damage, directed at the head (more specifically, the face). The psyker can reduce this Damage by an amount equal to his Willpower Bonus. This Damage bypasses armour and any Toughness Bonus.

So, any psyker who wants to target me with his power, must roll WP. On failure he gets damange 1d10+ my WP bonus - his WP bonus bypasing armour and toughness.

Sustaining "projection" already brings penalty for casting other powers. Moreover, it says that you cannot project further than same solar system. Of course, what happens when you try to travel outside that range, is a question.

Funny question - what would happen if you project yourself near your fellow acolyte who is on a spaceship and that spaceship goes into warp travel ? because when spaceship will turn on Gellar field, a psyker would be trapped. There could be some interesting outcomes:

• one would become bodyless ghost, his body would die and a psyker would need to posess somebody to get a body for himself. Sounds very heretical!
• burn fate point and somehow manage to get to your own body and maybe get some damage
• one can't go back to his body until he is in the same solar system.
• die

Very interesting fact is that in DH Ascesion, there is a power which seems to allow to go back into your body despite being further than same solar system.

My Will, Manifest

Cost: 1200

Threshold: 30

Focus Time: 2 Full Actions

Sustained: Yes

Range: Self

The psyker’s psyche leaves its fleshy prison, roaming free as an invisible being of etheric energy. In this state, the psyker is all but invulnerable to mundane threats, and can travel great distances while leaving his body behind.

When this power is manifested, the psyker’s body collapses, and for all appearances goes into a deep coma. The psyker becomes an ethereal being of light and crackling energy with the Incorporeal Trait. He is also completely invisible to non- psykers, although anything with a Psy Rating perceives him normally, and mechanical devices perceive strange ‘auspex ghosts’ or ‘visual anomalies.’ The psyker’s new form has a movement speed equal to his Willpower bonus, though a successful Challenging (+0) Willpower Test allows him to quadruple his speed for 10 Rounds. The psyker may use other powers in this form as normal. In this state, the psyker perceives the world differently—psy-active beings or items glow with brilliant light whilst more mundane surroundings seem muted and grey.

Unlike normal Incorporeal beings, in this state the psyker may attack non-Incorporeal targets with a Psy Rating, and they may attack him in turn. Both may make melee attacks using Willpower instead of Weapon Skill, and dealing 1d10 plus their Willpower bonus in damage, ignoring armour and Toughness.

If the psyker’s body is killed while in this state, the psyker dies. If the psyker wants to return to his body, he must move back to it and spend one half action to renter it. He may renter it instantaneously from any location—however if he does so, he immediately takes 2d10 wounds, ignoring armour and toughness.

Also, a minor question. what happens when your body dies while you are projecting? you just die?

Can you go through walls using projection?

Can you go through walls using projection?

You might want to be more specific. I would assume you can project yourself to a target behind a wall, yes, but you do not actually move around while you're using projection. It's not like you're making a ghost of yourself. You're essentially possessing your target (albeit can't actually influence anything they do).

The power indicates it has a range of approximately an entire Solar System, so I'd be surprised if a wall could stop it.