5x Berserker

Rip and Tear
At 1st level, your weapon attacks that score a critical hit cause the target to bleed for 1d10 turns.

Berserker Strike
At 3rd level, you can use your bonus action to make one weapon attack. After you attack, you must make a Constitution saving throw against a DC of 10. On a failed save, you gain one level of exhaustion. The DC of this feature increases by 2 for each level of exhaustion that you have.

If the attack granted by this feature scores a critical hit, you automatically succeed on the Constitution saving throw.

Adrenaline Rush
At 6th level, when you kill a creature you regain the use of your bonus action this turn if you have already used it, and you automatically succeed on the next Constitution saving throw that you make if it is made during this turn.

Carnage
At 9th level, your weapon attacks score a critical hit on a roll of 19 and 20.

If your weapon attacks already score a critical hit on a roll of 19 and 20, then your weapon attacks score a critical hit on a roll of 18 as well.

Berserker Frenzy
At 13th level, you can use your bonus action to enter a frenzy. While in a frenzy, you gain the following effects; Your frenzy lasts for 1 minute, and ends early if you are unconscious. You can use this feature once, and you regain the use of it when you finish a short or long rest.
 * Your walking speed is increased by 10 feet.
 * You ignore the negative effects of exhaustion, excluding death.
 * You make saving throws against the charmed, dominated, frightened, and terrified conditions with advantage.

Maximum Carnage
At 17th level, your weapon attacks score a critical hit on a roll of 18, 19, and 20.

If your weapon attacks already score a critical hit on a roll of 18, 19, and 20, then your weapon attacks score a critical hit on a roll of 17 as well.