Pact Of The Struggler

“You’re right, we are mortal and fragile. But even if we are tortured or wounded, we’ll fight to survive. You should feel the pain we feel and understand. I am the messenger that will deliver you to that pain and understanding.” 

A pact very common amongst humans and people with immense amounts of trauma within their past. People who take the Pact Of The Struggler acknowledge that they are not a God, they are not something other than a fighter, longing for the next battle for they have nothing else to depend on. Fighters who take this pact often long for someone to give them purpose and a reason to struggle on. Or they just really like Berserk and can't be bothered to multiclass.

Berserk

Beginning when you choose this archetype at 3rd level, you can enter a rage in which you fight with primal ferocity
 On your turn, you can enter a rage as a bonus action.

While raging, you gain the following benefits if you are armoured with anything above light armor

• You have advantage on STR checks and STR saving throws.

• When you make a melee weapon attack using STR, you gain a +2 bonus to the damage roll. This bonus increases as you level.

• You have resistance to bludgeoning, piercing, and slashing damage.

You are able to cast spells during Berserk, but you cannot cast rituals.

Your rage lasts for 1 minute. It ends early if you choose for it to or if your turn ends and you haven't attacked a hostile creature since your last turn.

Struggler's Endurance

Starting at 7th level, you can add half your proficiency bonus (round up) to any Strength, Dexterity, or Constitution check you make that doesn’t already use your proficiency bonus. In addition, when you make a running long jump, the distance you can cover increases by a number of feet equal to your Strength modifier.

During Berserk, you can use your full proficiency bonus (Round up) instead of half.

Brand Of Sacrifice

At 10th level, a deity will come to you and bless you with a gift of power. You can choose two of four:

Berserker Armour: A set of heavy armor that can be formed around your body at any time as a bonus action. The armor has resistance to all types of damage aside from holy. During Berserk with the armor active, you can now cast rituals. Aswell as this, Your Berserk ability is enhanced:
You have advantage on STR checks and STR saving throws.
When you make a melee weapon attack using STR, you gain an extra +2 bonus to the damage roll on top of your original (The one that increases as you level) 
You have resistance to all damage but holy
You are able to cast all kinds of spells during Berserk
Your rage lasts for 3 minute. It ends early if you choose for it to or if your turn ends and you haven't attacked a hostile creature since your last turn.

Dragonslayer: Any heavy weapon you wield can be swung with the speed of a stick, giving a +5 to all hit rolls with heavy weapons. All heavy weapons now do 1d4 magic damage on every hit. During Berserk, All heavy weapons do 1d8 magic damage.

100 Man Slayer: A fighting style and an ability score increase balled into one. Increase any of STR, DEX, or CON by 6 and gain the Black Swordsman Fighting Style. This allows extra damage with all heavy weapons, making all attacks done with them do an extra 1d4 damage. Aswell as giving you an extra action if you choose to use it

Major Ability Score Increase: Increase three scores of your choice by 4

Blood And Guts

Starting at 15th level, During Berserk, All attacks will stun the target and drain their health by how much damage you deal during the first turn of activation. Additionally, Hit rolls with a score of 16-20 will score a critical hit.

Berserk (Evolved)

At 18th level, Berserk will shift into a stronger variant. During the first two turns of activation, you will be invincible. Berserk no longer has a time limit and can be active until death. attacks rolled at 12-20 will score a critical. All damage dealt is increased by +9. 

Additionally, Beserker Armour, Dragonslayer and 100 Man Slayer are all granted. You are the strongest.

"Only life by sword shall reign
And he never to death be slain."