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==== Manifesting a Power ====
When a psion manifests a spellpower, she has to channel wacky energies through her brain. As one can imagine, this can really tucker someone out after a while, and this ''strain'' is the basic limiting factor that determines how many powers a psion can do without resting. Every power has a Strain Cost, which depends on the level of the power and the level of the manifester, as shown on the tables below. At high class levels, some powers have a negative Strain Cost - this counts as a Strain Cost of 0 - and this is pretty much okay. Powerful psychics can do basic things forever without expending effort and have that reflected by the fact that they don't strain themselves doing it.
Whenever a psychic manifests a power, she accrues Strain equal to either the Basic Cost - unless she wishes to manifest the power at a higher manifester level. Then she determines her current Basic Cost for the power, the Level Differential between her intended Manifester Level and the power's Original Level, and adds 0.5 Strain per Level Differential to the Basic Cost.
