Beast Within

A Beast Within warlock is made one of three creatures is bound to them. The first is a Dragon true beasts of the sky and a powerful creature to be part of, the second is the Kraken a creature of the sea with devastating power and can level city’s in one blow, the last is one of truly devastating power the Tarrasque only one can live and it lives in you bound for all time.
When a Beast Within warlock is born a creature with great power is born and their souls are intertwined for as long as both live. There powers are shared through spirit chains binding their souls into one body normally the body of the warlock. 

Bound Beast

 Starting at 1st level, you can pick the Beast you are bound with. The table will show you what Beasts you can choose and what passive abilities you gain. You can only pick one and cannot change it.

Dragon

Speed: 40 ft., climb 40 ft., fly 40 ft.

Damage Resistance: (depending on the colour of dragon you choose depends on the resistance you gain eg. red fire resistance, blue lighting resistance..)

Senses: darkvision 60 ft.

Languages: Common, Draconic

Kraken

Speed: 40 ft., swimming 60 ft.

Ability’s: can breath air and water.

Damage Resistance: Lighting

Condition Immunities: Frightened, Paralyzed 

Senses: Truesight 15 Ft.

Languages: Understands Abyssal, Celestial, Infernal, And Primordial (but cannot speak it), Telepathy 60 Ft.

Tarrasque

 Speed: 40 ft.

Damage resistances: Fire, Poison.

Condition Immunities: Frightened, Poisoned and Charmed.

Senses: Blindsight 30 Ft.

Beasts Blessing

Starting at 1st level, when you reduce a hostile creature to 0 hit points, you may have your beast eat the corpse as a bonus action to gain 1d4 + 1 to your next attack. At level 5 it becomes 1d8 + 1. At level 10 it becomes 2d8 + 1. At level 17 it becomes 3d8 + 1

Soulflame Bond

Starting at 6th level, the nature of the beast starts so show its self as your mind and body grows and adapts to the power of the beast.  Once per long rest you can gain temp hits points equal to your warlock level + 1d6

Domain Of The Beast

Starting at 10th level, you may use your action to cast the monster domain ability any creature that is in a 30 ft cube scented on yourself of medium or smaller size that has to make a wisdom saving throw DC 17, if the creature fails the save it must run away from the caster until it is out of the area of effect. This effect is a concentration and lasts for 1 minute. If the creatures it passes the save it only moves 10 ft back from it original place.

Once you use this feature, you can’t use it again until you finish a long rest.

Power Of The Beast

Starting at 14th level, your bond with your beast has grown to much that you are able to use one of the attacks that the creature knows. This can be seen in the table blow. (At level 20 you have 2 uses of this before needing a long or short rest.)

Once you use this feature, you can’t use it again until you finish a short or long rest.

Dragon: Breath. The user exhales  A element corresponding to the colour of the dragon in a 30-foot cone. Each creature in that area must make a DC 17 Dexterity saving throw, taking 6d8 fire damage on a failed save, or half as much damage on a successful one.

Kraken: Tentacle: Melee Weapon Attack: CHR modifier to hit, reach 30 ft., one target. Hit: 3d6 + 6 bludgeoning damage, and the target is Grappled escape DC 17. Until this grapple ends, the target is Restrained. The user has 4 tentacles, each of which can grapple one target.

Tarrasque: 

Claw. Melee Weapon Attack: CHR modifier to hit, reach 15 ft., one target. Hit: 4d8 slashing damage.

Horns. Melee Weapon Attack: CHR modifier to hit, reach 10 ft., one target. Hit: 4d10 piercing damage.