Hunter

Where some rangers specialize in slaying dragons or giants, many rangers seek to purge the world of unliving creatures. Those who face the undead learn to strike hard to ensure a zombie’s destruction; to steel themselves against the curses, diseases, rot, and necrotic energies that suffuse many undead attacks; and to lash out at a ragged swarm of shambling ghouls before it can get too close.
The following options expand on those found in the PH.

Hunter’s Prey

At 3rd level, you can choose the following feature as your Hunter feature for that level.

• Zombie Killer: When you damage an enemy with a weapon attack, that enemy has disadvantage on the next saving throw it makes before the end of your next turn.

Defensive Tactics

At 7th level, you can choose the following feature as your Hunter feature for that level.

• Resist Death: You have advantage on saving throws made to avoid being cursed or paralyzed and you have resistance to necrotic damage.

Multiattack

At 11th level, you can choose the following feature as your Hunter feature for that level.

• Skirmish Attack: You can use your action to choose up to 3 creatures within 30 feet of you that you can see and make a melee attack against each of them. Each creature must be within your reach to attack it, though you can use your movement before and after each attack to put those creatures within your reach.

Superior Hunter’s Defense

At 15th level, you can choose the following feature as your Hunter feature for that level.

• Superior Resilience: When you are subjected to an effect that allows you to make a Constitution saving throw, such as a ghast’s stench or a wraith’s life drain, you can use a 20 instead of the number you rolled on the die for that saving throw. 
  You can use this feature up to three times. You regain all expended uses of this feature when you finish a short or long rest.