 Undercast Surge (Su) (Occult Adventures pg. 62): When the psychic undercasts a spell (see page 144), she can spend points from her phrenic pool to increase the spell’s effective level, essentially using up a lower-level spell slot to cast a higher-level version of the spell. This costs 2 points per spell level increased. She can’t use this ability to cast a version higher than the version she knows. For instance, a psychic who knows mind thrust III but not mind thrust IV could cast mind thrust II and spend 2 points to treat it as mind thrust III, but couldn’t spend 4 points to treat it as mind thrust IV. This amplification can be linked only to spells that can be undercast.
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