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Powers like Psionic Image, Thought Projection, Far Hearing, Psionic Spark and Telekinetic Grasp. Can a character standing outside a window use these pseudo-cantrips on something/someone inside the room that he can see?

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You cannot use any of those powers through a pane of glass or any other transparent block. This is because all powers unless they state otherwise require line of effect. You have Line of Sight since you can see the target, but you do not have Line of Effect.

Line of Effect:

A clear line from one point to another point in an encounter that doesn’t pass through or touch blocking terrain. Unless noted otherwise, there must be line of effect between the origin square of an effect and its intended target for that target to be affected.

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    \$\begingroup\$ Almost no power requires line of sight AND effect. A large majority only requires line of effect (eg, you can still make attacks while you are blinded), and every Teleportation effect only requires line of sight. \$\endgroup\$ – Nibelung Aug 28 '15 at 14:05
  • \$\begingroup\$ @Nibelung You're right, I removed the part about needing LoS. Teleportation falls under the 'Unless noted otherwise' in the rules text. \$\endgroup\$ – diego Aug 28 '15 at 14:09

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