There is a 98.95% chance to gather Perer when tapping Perer (375p). There is also a possibility for:
Seed of Detection: 1%
Kashuron’s Memento: 0.05%
You must first learn: Morph Method: Perer - Morphing Designs can only be purchased at Abyss Fortresses from the Quartermaster.
Purchasable from the Divine Fortress Quartermaster, Smintian