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While psi can manifest in an almost unlimited number of ways, it tends to fall into one of several common categories, known as powers. For example, any ability involving shared thoughts is generally considered “telepathy”, wile any use of thought to impart energy to matter in some way is categorized as “psychokinesis”. They’re both psionics (i.e., they share the same source, that of mental energy), but each has a distinct focus. The most common powers are found in Chapter 3 of Psionics Powers.
A power is not a trait; you wouldn’t buy “Psychokinesis” as an advantage. Instead, once you buy one or more of the abilities in that power, you are said to “have” that power (or “know” that power). For example, if you buy a few levels of Cryokinesis and TK Grab, you know Psychokinesis – you are a psychokinetic psi.
It’s easier to build a skilled psi if you focus on one or two powers. This makes it possible to afford high levels of Talent, which leads to better skill levels for your abilities.