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Reagents are the way of getting spore enchants. They can only be applied to spore weapons and armor. They can be used by hovering them over the item you want to enchant and right clicking. There are four different reagents that apply their own unique enchantment. Using a reagent may come with a cost, however, as when using a reagent, there is a 10% chance that it will also give the item a curse. There are two different curses reagents may apply. Read the Enchantments page for info on each enchantment.
Any Type
Symbiotic Reagent - Any type
Usage: Applies the Symbiotic Reconstitution enchantment to weapons and armor.
Symbiotic Reagents are required to make Corrosive Reagents, Cryogenic Reagents, Gastric Reagents, Serrated Reagents, and Voracious Reagents.
Obtaining: Crafted with three Mutated Fibre, three Nerves, one Mutated Heart, and one Living Core. They are also dropped as rewards from an Arena Tendril raid.
Stack Size: 64
ID: spore:symbiotic_reagent
Voracious Reagent - Any type
Usage: Applies the Voracious Maw enchantment to weapons and armor.
Obtaining: Crafted with three Fangs, three Innards, and one Symbiotic Reagent. They are also dropped as rewards from an Arena Tendril raid.
Stack Size: 64
ID: spore:voracious_reagent
Weapon Type
Corrosive Reagent - Weapon type
Usage: Applies the Corrosive Potency enchantment to weapons.
Obtaining: Crafted with three Corrosive Sacks, one Altered Spleen, and one Symbiotic Reagent. They are also dropped as rewards from an Arena Tendril raid.
Stack Size: 64
ID: spore:corrosive_reagent
Cryogenic Reagent - Weapon type
Usage: Applies the Cryogenic Aspect enchantment to weapons.
Obtaining: Crafted with six Freeze Burned Biomass, two Ice Canisters, and one Symbiotic Reagent. They are also dropped as rewards from an Arena Tendril raid.
Stack Size: 64
ID: spore:cryogenic_reagent
Gastric Reagent - Weapon type
Usage: Applies the Gastric Spewage enchantment to weapons.
Obtaining: Crafted with three Innards, three Buckets of Bile, and one Symbiotic Reagent. They are also dropped as rewards from an Arena Tendril raid.
Stack Size: 64
ID: spore:gastric_reagent
Armor Type
Serrated Reagent - Armor type
Usage: Applies the Serrated Thorns enchantment to armor.
Obtaining: Crafted with three Spikes, one Corrosive Sack, and one Symbiotic Reagent. They are also dropped as rewards from an Arena Tendril raid.
Stack Size: 64
ID: spore:serrated_reagent
Trivia
The term 'reagent' in real life means "a substance or mixture for use in chemical analysis or other reactions."