Board Thread:Questions and Answers/@comment-26338505-20150423170714/@comment-4010041-20150423200313

He was availbale from the Tribal Power Promo Pack (http://castleage.wikia.com/wiki/Oracle_Promo_Packs#Tribal_Power_Promo_Pack)

It says that on his page: http://castleage.wikia.com/wiki/Aki

Since that pack is no longer available, neither is he.