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Can I use my Fervor power to cast a sorcerer spell?

Can I use my WarPriest levels as a prerequisite to select the Arcane Armor Training feat?

Thanks.

From the rule book

As a swift action, a warpriest can expend one use of this ability to cast any one warpriest spell he has prepared. When cast in this way, the spell can target only the warpriest, even if it could normally affect other or multiple targets. Spells cast in this way ignore somatic components and do not provoke attacks of opportunity. The warpriest does not need to have a free hand to cast a spell in this way.

Warpriest spell being the key words there. So no you cannot use it to cast a sorcerer spell.

Yes you may use your caster level for arcane armor traning. It does not specify Arcane caster lever. So a Warpriest 1/Sorcerer 2 could take Arcane Armor Traning