Hi-Ether

Hi-Ether is a medicine for restoring MP.

Source
Hi-Ether can be crafted, obtained as a drop from duties, as a quest reward, or purchased from vendors.

Crafting
Hi-Ether can be crafted by alchemists as a level 35 recipe with the following materials:
 * x1
 * x1
 * x1
 * x4
 * x3

Duties
Hi-Ether can be obtained as a drop from the following duties:
 * The Sunken Temple of Qarn
 * Cutter's Cry
 * The Stone Vigil
 * Dzemael Darkhold

Quests
Hi-Ether can be obtained as a reward from the following quests:
 * Not My War
 * Battle Scars
 * In the Company of Heroes
 * Lord of Crags
 * With the Utmost Care
 * Pests in the Pillars
 * Windy Wedding
 * The Voyage of the Goobbue
 * Mr. Slipshod and Ms. Uptight
 * Thieves and Robbers
 * Burn Before Reading
 * Love's Hard Labor
 * Physician, Find Yourself
 * Crazy about Crystals

Vendor
Hi-Ether can be purchased from the following vendors:
 * Blue Lily - East Hawker's Alley, Limsa Lominsa Lower Decks
 * Albgast - Ebony Stalls, Old Gridania
 * Junkmonger - Forgotten Springs, Southern Thanalan
 * Haneko Burneko - The Waking Sands
 * Rarakiya - Sapphire Avenue Exchange, Ul'dah - Steps of Thal
 * Pienne - The Jeweled Crozier, The Pillars