Essences are used both in crafting magical items, a well as reagents for spells. Elemental essences are dropped by their respective guardians, and all essences can also be crafted using the Essence Refiner.
Air Essence is a component added by Ars Magica 2. It is used to craft the Battlemage Boots, Slipstream Generator, and Flicker Focus: Lunar Tides. It is also used to create certain spells in the Crafting Altar.
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Flickers Jars
Air· Arcane· Earth· Ender· Fire· Ice· Life· Lightning· Nature· Water
Weapon
Hell Cow's Horn· Nature's Scythe· Winter's Grasp
Binding
Bow· Sword
Armor
Armor
Ender Boots· Magitech Goggles
Battlemage
Circlet· Armor· Leggings· Boots
Boss Armor
Antenna of the Fire Guardian· Earth Armor· Water Orbs
Sigil Stand· Sigil of Gentle Rains· Sigil of Nature's Bounty· Sigil of The Felled Oak· Sigil of The Flat Lands· Sigil of Butchery· Sigil of Progeny· Sigil of Containment· Sigil of Interdiction· Sigil of The Light· Sigil of The Lunar Tides· Sigil of The Packed Earth