SR5:Spells:Health

Health spells can heal physical injury, cure diseases (or inflict symptoms), detoxify poisons or drugs (or mimic their effects), and modify attributes. No techniques currently known to magic can erase Stun damage or cure psychological conditions. All health spells require the magician to physically touch the subject of the spell—this “laying on of hands” is traditional in magical healing lore the world over.

Most health spells are cast with a simple Spellcasting + Magic [Force] Test. Exceptions are listed in the spell descriptions.

Essence

Low-Essence characters are more difficult to affect with some health spells. It’s hard to put the body back into its natural state when that state has been unnaturally altered. In game terms, this means you take a dice pool modifier equal to the target’s actual Essence minus his maximum Essence (which will turn out to be 0 or a negative number), rounded up.