How can I best optimize an NPC so that instead of having perfect power attack or sneak attack, they're just really hard to kill? I can think of thief acrobat and perhaps exemplar or dungeon delver, ...
In Mutants and Masterminds you can purchase a side kick as a feat. I'm rolling up a knight, and I want a squire, using a similar game mechanic. Is there anything like this in DnD, other than ...