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Each character begins with a single Soul-Link slot - although, depending on their star-level, more of these may be unlocked by maxing out their Soul-Tree - and this slot may be filled with any of your currently unused characters.
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The last two ways a character can be empowered involve Soul-Linking them to someone else (which - unlike Fusion - doesn’t destroy the character-involved), alongside the equipping of accessories.
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Furthermore, these training-ground missions - at least for the first-time each of them are attempted - additionally serve as yet another source of those valuable aforementioned Soul-Orbs (which can optionally be used to max-out a Soul-Tree node in lieu of crystals). These missions are always repeatable to your heart’s content - as least so long as you have the necessary Soul-Tickets on-hand - and feature enemies whom only drop the promised item, and as such are vastly expedient compared to virtually anything else. Although these crystals will drop randomly during most missions - as well as earned via daily rewards - the foremost method of obtaining these will be Kisuke Uruhara’s daily training-courses, with the focus upon a different crystal-type for each day of the week.
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