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.
Arcane Compendium· Crystal Phylactery· White Chalk· Blue Chalk· Red Chalk· Keystone· Lightning Charm· Life Ward· Mana Cake· Player Journals· Spell Parchment· Warding Candles· Wizard's Chalk· Workbench Grid Upgrade
Air· Arcane· Earth· Ender· Fire· Ice· Life· Lightning· Nature· Water
Hell Cow's Horn· Nature's Scythe· Winter's Grasp
Ender Boots· Magitech Goggles
Circlet· Armor· Leggings· Boots
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