Untouchable

Untouchables, also known as blanks, pariahs and psychic nulls, are individuals who have no warp signature.
They are not psykers, in fact they are completely the opposite.
Their presence frequently acts as a damper on psychic activity,
lessening or even completely halting its effects. Untouchables,
like psykers, actually have different grades of “ability”, though
few savants have actually been able to study them closely due
to their extreme rarity. Their strange aura makes most folk
uncomfortable around them, and for this reason they are
often loners, outcasts and pariahs. Of all Imperial institutions,
the Inquisition makes the greatest use of Untouchables.
==The Untouchable and the Profane==
An untouchable (thanks to his special nature) is spared
some of both the perils of interaction with the Warp and
some of its potential powers and benefits. An untouchable
may not for example, under any normal circumstances
enter into a Dark Pact with a warp entity or receive the
benefits of beneficial psychic powers, sorcery or true faith.
They may not learn sorcery or take any talents associated
with it and may not have faith talents. A force weapon, daemon
weapon, or occult artefact (or the like) in the hands of an
untouchable is merely a weapon or object of its type. The
untouchable may not unleash or benefit from any of the
weapon’s special powers or abilities, or (in the case of a
daemon weapon) master it. However, the same also applies
to such items and weapons used against the untouchable.
Other than base damage listed (a sword in the guts is still
a sword in the guts after all) any other particular effect
such a weapon would normally have on the untouchable
is likewise ignored.
Because of their unique place in the universe of Dark
Heresy, untouchables in games may bring up odd questions
about their nature in the rules and options such characters
may take. In all cases it is up to the GM’s own good sense
and judgment to decide how they are handled.
==Background Package==
Career: Any Career, but you may not possess a Psy Rating.
Special: May have no other package, talent, trait or similar
that grants psychic, faith or warp-based powers or abilities,
both during creation or later development.
Cost: 400 XP
Effects: Apply all of the following changes to your character:
Characteristics: The character’s starting Fellowship
Characteristic is reduced by 10 (if the character’s Fellowship
is 10 or less already, it is reduced to 1) but may later be
increased as normal.
Unsettling Presence: An untouchable suffers a –10 penalty
to all Interaction Skill Tests.
Psychic Blank: The character may never gain Psychic
Powers, Pure Faith, Sorcery or related Talents.
Psychic Invulnerability: An untouchable is completely
immune to Psychic Powers, psychic energy and effects
directed against them (as well as warp powers, possession,
sorcery, Corruption from warp shock, and so forth) Also,
he cannot be detected by means of Psyniscience, Sense
Presence, or similar abilities---powers of this type directed
at their person, even though successfully manifested, simply
fail. Powers in whose wider areas he is caught simply fail to
affect him—although they may affect other people normally,
subject to their disruption effect.
Psychic Disruption: All Psychic Powers and abilities
manifested in the character’s immediate area (a radius equal
to the Untouchable’s Willpower Bonus in meters) have their
Threshold increased by 10, plus any associated Test by the
psyker (such as Willpower Tests) have their Difficulty increased
by –20. Additionally, entities subject to Warp Instability will
suffer double Damage from its effects while in this area.
Note: It may still be possible to indirectly affect an
untouchable with a Psychic Power—for example, a boulder
telekinetically dropped from a great height on an untouchable
will still flatten them. This is left entirely left to the discretion
of the GM.