5e Fighter Subclass: Shieldbearer

D&D 5e doesn't have a proper tank class. It has the barbarian, who can take deadly hits as if they were being slapped by wet tissue. It has classes that can fix terrible, mortal wounds - even death is temporary.

What it doesn't have is a class or subclass that prevents harm, like a good and proper team-playing tank.

The Shieldbearer fixes that. The Shieldbearer focuses less on how much pain he can dish out to his enemy, and more on how to protect his allies from the serrated blades and gnashing fangs mere inches from their face, interposing himself and his shields between them.

Yes, shields. Plural.

The mechanics are based on the Dodge action and extra reactions. It's a different take on mechanics than most characters you'll play, with most of what you do happening outside of your turn: counter-attacks, diving in front of flying projectiles, and moving alongside whomever you're protecting, to shelter them from the bite of the blade. It's a subclass for whom tactical positioning is key, and who looks at battle very differently than most characters.