Runic Deer Soul: Drop from Rainbowhorn Mystic. Needed Great Horn of the Runic Deer to invoke it.
Wolfhawk Soul: Drop from Skuld Vit. Break through the barrier using Soul Form.
Shadowstalker Soul: Drop from Valfir the Unyielding. You need to complete the 1st chapter of the Sylph campaign and the Anima Driver at 3.
Equine soul: Sylphs Campaign Quest Reward Mend a broken heart.
Arden's Moth Soul: Sylphs Campaign Quest Reward Drust and ashes.
Gryphon soul: Random Reward from Randomized and Scored BG.
Wyvern Soul: Random Reward from Randomized and Scored BG.
Raptor soul: Drop from Mueh'zala in the dungeon The other side.
Chillon soul: Drop from Mistcaller in the Mists dungeon of Tirna Scithe.
Zampon soul: Chest of the Queen's Greenhouse.
Shaker Soul: Chest of the Queen's Greenhouse.
Crane soul: Honored with The Wild Hunt.
Leonine soul: Friendly with Court of the night.
Lupine soul: Friendly with Court of the night.
Tiger soul: Friendly with Marasmius.
Osuna soul: Friendly with Marasmius.
Moose soul: Sold by salorn. Participate in at least 5 different encounters of the Ardenweald Amphitheater Works.
Alavelo soul: Drop from Sire in Heroic Nathria Castle.
Cobra soul: Undiscovered.
Hyena soul: Undiscovered.
Hippogriff soul: Undiscovered.
Owl cat soul: Undiscovered.
Deer soul: Undiscovered.