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These three options, undoubtedly, are all extremely practical.
Especially the first two.
Intelligence goes without saying; it is the core attribute of a Psychic Sorcerer, only wished it could be higher, no one complains it's too low.
Especially since intelligence is closely related to IQ, at least in terms of thinking ability, memory capacity, and mental arithmetic skills, all would see a significant improvement.
The second choice, to say it's precious, is not really, as mages at higher professional levels generally have quite a few extra spell feats.
But to say it's not precious, this thing is an extra special spell feat, with the chosen related feats applied to spells, it becomes quite formidable at low professional levels without enhancing spell slots.
The example is at hand, Susie who just underwent Dragonization, her Instant Cast Magic feat can be categorized as a special spell feat.
