Editing Warhammer 40,000/7th Edition Tactics/Psychic 101 (section)

== 5: Resolve Power ==
Unless otherwise stated, psychic powers with a duration last until the start of the Psyker’s next Psychic phase. The ongoing effects of any one particular power do not stack on the same unit, but benefits from different powers are cumulative. Unless otherwise stated, powers cannot modify characteristics above 10 or below 1 (or below 2, in the case of Leadership).

When a power summons a unit, it Deep Strikes within the power's maximum range; the new unit is under your control and is treated as having arrived from Reserves for all rules purposes. If the new unit suffers a Deep Strike mishap and ends up in Ongoing Reserves, it can Deep Strike anywhere on the board when it enters play.  Summoned psykers cannot use summoning on the same turn they're summoned.  Unless otherwise stated, summoned units have no upgrades and generate all random attributes (such as psyker powers) as soon as the power resolves.  Summoned Chaos Daemons can take an Icon and/or Instrument of Chaos, and/or upgrade to a character, if their codex entry says they can (and they do it for free).

That covers Blessings (targets friendly unit(s)), Maledictions (targets enemy unit(s)), and Conjurations (summons a new unit).
*'''Witchfires'''
**Resolve as Shooting attacks (non-witchfires which affect an enemy unit do not), although because they happen in the Psychic phase, not the Shooting phase, Shooting phase specific consequences of shooting do not apply, such as preventing running.  Note that this normally means the Psyker has to roll to hit or scatter using BS as normal unless the power is a Template or otherwise stated, although some sub-types of Witchfires subvert some of the shooting rules (see below), including needing to roll to hit.  Per the Errata, a witchfire power which does not list a weapon profile hits automatically.
***'''''Focused'' Witchfires'''
****If this witchfire was cast using at least one more Warp Charge than it needed, its hits are ''Precision Shots''.
***'''''Profileless'' Witchfires'''
****A witchfire with no profile hits automatically, without needing to roll to hit.
***'''Beams'''
****Beams automatically hit, and, in a curiosity for WH40K, are usually offensive powers capable of hitting your own units. Choose a point within the power’s range and trace a 1mm thick line between the chosen point and the center of the Psyker’s base – [[Derp|this line cannot be drawn over any unit that is locked in combat]]. All units under the line [[AWESOME|(friend and foe)]] are hit, with the exception of Zooming Flyers, Swooping Flying Monstrous Creatures, and the Psyker himself (or his transport, if embarked on one). Each unit hit by the attack takes a number of hits equal to the number of models from that unit that are under the line. Only one unit that has a model under the line can attempt to Deny the Witch.
*****Note:  Remember, beams are drawn from the CENTER of the casting model, unlike all other types of witchfire, so the range is shorter than you're used to.
***'''Novas'''
****A nova power automatically targets and hits all enemy units (including Flyers and Flying Monstrous Creatures) within the psychic power’s maximum range, regardless of line of sight, being locked in combat, intervening models/terrain and so on. Only one unit that is within the power’s maximum range can attempt to Deny the Witch.  
*****Note that Nova powers are drawn from the edge of the Psyker's base with the range defining the circle's radius, so the diameter of the circle is double the power's range plus the diameter of the psyker's base, meaning a larger base can drastically increase the area under the power.