While reading the comments of this answer, I came across the following statement :
... if you still have 5 slots you can still use the [Divine] Smite 5× in a round
(with 2 attacks, times two with a feat, and one bonus attack) ...
What feat could the commenter be referring to?
I am aware of the Fighter's 2nd level class feature, Action Surge, but am not aware of a feat available to other classes ( specifically Paladin ) that grants the quoted "times two with a feat" effect/ability.
I've looked through my PHB's feats section and don't see anything. What am I missing?