Or you could use the rules provided.Still optional.
I could talk to my DM and use a homebrew warlord instead.
I also find it hard to believe your DM won't allow feats but will allow an entire new class .... even if it was published in a new rulebook since it would surely be optional.
I described one use in the example above and I gave you the page number in the PHB so you could look it up, but I will put the text from the PHB here, note the bolded text:Strike 1.
Describe a improvised action that could use those manevuers that would be worth spending the dice.
"..... intimidating enemies, sensing weakness in magical defenses or calling for parley with a foe. The only limits to the actions you can attempt are your imagination and your character's ability scores."