Sheild and Feat question I'm new and playing a warlock and am looking to give my pc a little boost in ac, and to do that, I'm considering a shield. As I understand it, I won't be able to cast my Eldritch Blast cantrip without some sort of shield proficiency or feat.  


Can I just take the War Caster feat, or do I need to take something like the Moderately Armored feat so I can even be proficient (specifically regarding casting)?