Proof of completion of the third mission is a level 50 Common item in AION Retail 7.8. The quest The Handmade Heart rewards it.

Where to get

Rewarded by

Quest	Reward	Quantity
The Handmade Heart	Basic reward	5

Similar items

Item	Grade	Level
Construction Odium of Magic	Common	50
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Tanned Noble Solid Balaur Skin	Heroic	50
Jerky for Pets	Fabled	50
Eternal Panacea: Masterful Attack Boost	Eternal	50
Bagatur's Spirit Stone	Mythic	50
Fragrant Root	Junk	50