I've been tinkering for a day an a half already on different iterations of a low level warlock. For a no DEX build, I'd say:
Human (variant) Fighter 1/ Warlock 1: Heavy Armor Mastery (feat), Blade Ward, Amor of Agathys.
Gear: Splint Mail, Shield, Longsword.
It kind of reminds me of the 3.5 PrC...