Crystalite Magic

humans are not innately magical creatures. bonding with one or more crystalites will usually give very minor elemental magical gifts (equivalent of a cantrip). for those who want to really develop their magical abilities, concentrated long-term work with a crystalite is required, and those who have that dedication and discipline are rare. the magical results are also very unpredictable - they are not logically proportionate with amount of effort or even apparent talent. humans who take this route are often those who are willing to let themselves crystalize as much as necessary, as their ongoing work with their crystalite(s) cannot be paused to let their bodies decrystalize occasionally.
crystalites themselves are innately magical, even when they become significantly more flesh-and-bones. a sky crystalite can conjure a brisk wind, a fire crystalite can light a candle, a flower crystalite can make a bud blossom, etc. for the crystalites that have multiple innate elements, they can usually (but not always) only use their ‘primary’ element’s cantrip-equivalent unless trained. few crystalites have greater innate power and skill than this basic level, however, and those that do are considered nearly deific and either sought out by hopeful companions or studiously avoided for safety. fel crystalites frequently have a higher-than-usual base level of magical power and can be more canny in how they use it.
as with any group, there are statistical outliers. some individual crystalites (regardless of their type’s rarity or “specialness”) have greater magical power than average, or have very uncommon kinds of elemental or non-elemental magical abilities. those are documented on a case-by-case basis and are highly, highly prized among both human scientists and would-be sorcerers.

typical cantrips

these are common types of cantrips that many crystalites of a given element can do and can share with their human partners. they are all temporary changes or small-volume effects, but most can be repeated many times without tiring to produce a greater sum effect. by default, an untrained crystalite will have roughly twice the power in a cantrip as their equally-untrained human partner. both crystalite and human can train (together or separately) to increase their magical strength.
no crystalite magic can create something from nothing; it's all based upon using what is already present to create a desired effect.

Water and Sea

condense moisture from the air; convert a small amount of freshwater to saltwater or vice versa; minor influence over running water, currents, and waves; minor influence over mist or fog

Land and Earth

dig through small amounts of solid dirt as though it's loose soil; pack loose soil into very solid earth; crack or chip rocks more easily; form larger stones from a collection of small ones; disassemble larger sedimentary rocks into their smaller constituent bits

Sky and Wind

create a brisk breeze (strong enough to assist them in flying, if they can fly, or enough to give them a tailwind for running lessen a strong wind; breathe more easily in tight spaces; avoid breathing in as much smoke or gas as is present around them

Fire

ignite a tiny (lighter-sized) flame nearby; extinguish a tiny flame nearby; if venomous, increase inflammation near a wound they inflict; raise or lower internal body temperature a small amount (to adapt to weather or to manage pain or some kinds of minor illness like fever radiate a little light from their body

Ice

melt a small portion of ice into water or freeze a small amount of water into ice; create soft snow from solid ice or pack snow into firm ice; cool the air around them; cool their body temperature to avoid overheating

Lightning

static-level shocks; emit constant or oscillating light; avoid electrical damage; cause localized nerve pain or brief loss of control over a small body part (hand, foot)

Moon and Shadow

see through complete darkness as though dimly lit; remain visually hidden in a shadowed or dark place; fool an observer to think they are located near where they actually are; briefly reflect (not create) small lights

Wood

shape small sections of (living or harvested) wood; smooth or roughen a section of wood surface; more easily break a piece of wood or branch; mend a partially-broken or weakened piece of wood or branch; help roots grow deeper or longer

Foliage

minor influence over the health and resilience of growing plants; encourage plant growth; stop or reverse small patches of injury or illness in plants; compensate for small amounts of too much or too little water or sun or warmth

Flower (flowers, seeds, nuts, fruits, vegetables, and mushrooms)

lengthen the time a flower is in bloom; ripen a fruit more quickly or keep it ripe for longer; reverse small amounts of rot or injury; help a seed sprout more quickly; help mushrooms or vegetables or fruits or flowers grow more quickly or grow larger