I took the Extra Spell feat, which states that I can learn an extra spell, provided it is one less level than my maximum spell level. I am playing a WarMage, which is an arcane caster. I took Cure Serious Wounds as my extra spell, and my DM and I are not sure if that is allowed. I say it is, since the feat does not specifically say that it has to be an arcane spell. He says he thinks it has to be an arcane spell. Who is right?