Armor Class : 14 + Proficiency Bonus (natural armor)

Hit Points : Your warlock level multiplied by the sum of six plus the Felguard's Constitution modifier

Speed : 30 ft.

| STR : 16 (+3) | DEX : 12 (+1) | CON : 14 (+2) | INT : 10 (+0) | WIS : 12 (+1) | CHA : 12 (+1) |

Saving Throws : STR + 5, CON + 4

Skills : Athletics +5, Intimidation +3, Perception + 3

Damage Resistance : bludgeoning, piercing, and slashing damage from non-magical weapons

Senses : darkvision 60 feet, passive Perception 11

Languages : Eredun, understands the languages of its summoner

Challenge : X

Traits

Legion Strike : Once on each of its turns When the felguard make a Legion Axe attack, it can make another attack against a different creature that is within 5 feet of both the first creature and the felguard.

Actions

Legion Axe : Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 1d12 + 3 slashing damage.

Reactions

Pursuit : When a creature stops moving after leaving the felguard's reach, the felguard can use its reaction to move up to its speed towards the creature. This movement does not provoke opportunity attacks. The felguard can then make a Legion Axe attack against the creature if it is within reach.

Demonic Core

The demonic core of a felguard is a heart that never seems to stop dripping blood. A warlock who carries it gains the following benefits:

2nd Level : While carrying a felguard's core, the warlock has advantage on Strength (Athletics) and Wisdom (Survival) checks. While they hold the core, they can cast the Mage Armor spell at will.

5th Level : While holding the core, the warlock knows the Magic Weapon spell and can cast it without expending a spell slot once per long rest.

9th Level : While holding the core, the warlock knows the Bloodlust spell and can cast it without expending a spell slot once per long rest.

Armor Class : 13 + Proficiency Bonus  (natural armor)

Hit Points : Your warlock level multiplied by the sum of six plus the Felhunter's Constitution modifier

Speed : 40 ft.

| STR : 18 (+4) | DEX : 12 (+1) | CON : 14 (+2) | INT : 6 (-2) | WIS : 14 (+2) | CHA : 14 (+2) |

Saving Throws : DEX + 3, CON + 4

Skills : Perception +4, Stealth +3, Survival +4

Senses : blindsight 60 feet, passive Perception 14

Languages : Eredun, understands the languages of its summoner

Challenge : X

Traits

Disrupt Magic : If the felhunter damages a creature that then has to make a Constitution saving throw to maintain concentration on a spell, that saving throw is made with disadvantage.

Magic Resistance : The felhunter has advantage on saving throws against spells and other magical effects. Sense Magic. The felhunter can sense magic within 60 feet of it at will. This trait otherwise work like the detect magic spell but isn't itself magical.

Actions

Shadow Bite : Melee Weapon Attack; +6 to hit, range 5 ft., one target. Hit; 1d6 + 4 necrotic damage

Maul : Melee Weapon Attack; +6 to hit, range 5 ft., one target. Hit; 1d8 + 4 piercing damage

Dispel Magic (3/Long Rest) : The Felhunter can use Dispel Magic as a 3rd level spell.

Demonic Core

The demonic core of a felhunter is a squirming tentacle. A warlock who carries it gains the following benefits:

2nd Level : While carrying a felhunter's core, the warlock  has advantage on Intelligence (Investigation) and Wisdom (Perception) checks. While they hold the core, they can cast the Detect Magic spell at will.

5th Level : While holding the core, the warlock knows the Counterspell spell and can cast it without expending a spell slot once per long rest.

9th Level : While holding the core, the warlock knows the Locate Creature spell and can cast it without expending a spell slot once per long rest.

Armor Class : 13 + Proficiency Bonus 

Hit Points : Your warlock level multiplied by the sum of five plus the Imp's Constitution modifier

Speed : 25 ft.

| STR : 6 (-2) | DEX : 16 (+3) | CON : 14 (+2) | INT : 16 (+3) | WIS : 8 (-1) | CHA : 14 (+2) |

Saving Throws : DEX + 5, WIS + 1

Skills : Deception +4, Sleight of Hand +5, Stealth +5

Senses : darkvision 60 feet, passive Perception 9

Languages : Eredun, understands the languages of its summoner

Challenge : X

Actions

Claw : Melee Weapon Attack; +5 to hit, reach 5 ft., one target. Hit; 1d4 + 3 slashing damage.

Fire Bolt : Ranged Spell Attack; +5 to hit, range 60 ft., one target. Hit; 1d8 + 3 fire damage

Reactions

Phase Shift : When the imp is subjected to an effect that allows it to make a saving throw to take half damage, it can use its reaction to shift out of phase with the world and automatically succeed.

Demonic Core

The demonic core of an imp resembles a broken piece of horn, hot to the touch. A warlock who carries the demonic core of an imp gains the following benefits:

2nd Level : While carrying an imp's core, the warlock has advantage on Dexterity (Sleight of Hand) and Dexterity (Stealth) checks. While they hold the core, they can cast the Vicious Mockery cantrip.

5th Level : While holding the core, the warlock knows the Blink spell and can cast it without expending a warlock spell slot once per long rest.

9th Level : While holding the core, the warlock knows the Rain of Fire spell and can cast it without expending a warlock spell slot once per long rest.

Armor Class : 13 + Proficency Bonus (Natural Armor)

Hit Points : Your warlock level multiplied by the sum of six plus the Nether Dragon's Constitution modifier

Speed : 30 ft.

| STR : 16 (+3) | DEX : 12 (+1) | CON : 14 (+2) | INT : 14 (+2) | WIS : 14 (+2) | CHA : 10 (±0) |

Saving Throws : STR +3, WIS + 4

Skills : Arcana +4, Perception +4, Stealth +3

Damage Vulnerabilities : radiant

Damage Resistances : force, necrotic

Senses : darkvision 60 feet, passive Perception 11

Languages : Eredun, understands the languages of its summoner

Challenge : X

Traits

Spell Consumption : When the Nether Dragon Minion succeeds on a saving throw against a spell or spell-like effect, it takes no damage. Instead, it gains temporary hit points equal to the spell's level. Temporary hit points from this ability stacks with itself.

Actions

Bite : Melee Weapon Attack; +5 to hit, reach 5 ft., one target. Hit: 1d6 + 3 piercing damage.

Reactions

Force Shield : As a reaction, the Nether Dragon Minion can use it's reaction against an attack to increase it's AC by it's master's Intelligence Modifier, potentially making the attack miss.

Demonic Core

The demonic core of a nether dragon appears to be a fang infused with energies from the Twisting Nether. A warlock who carries the demonic core of a nether dragon gains the following benefits:

2nd Level : While carrying a nether dragon's core, the warlock has advantage on Dexterity (Acrobatics) and Intelligence (Arcana) checks. While they hold the core, they can cast the Arcane Blast spell at will.

5th Level : While holding the core, the warlock knows the Arcane Barrage spell and can cast it without expending a warlock spell slot once per long rest.

9th Level : While holding the core, the warlock knows the Deathwyrm's Fury spell and can cast it without expending a warlock spell slot once per long rest.

Armor Class : 13 + Proficency Bonus 

Hit Points : Your warlock level multiplied by the sum of six plus the Succubus's Constitution modifier

Speed : 30 ft., fly 15 ft.

| STR : 8 (-1) | DEX : 16 (+3) | CON : 14 (+2) | INT : 10 (±0) | WIS : 12 (+1) | CHA : 16 (+3) |

Saving Throws : WIS + 3, CHA + 5

Skills : Deception +5, Persuasion +5, Stealth +5

Senses : darkvision 60 feet, passive Perception 11

Languages : Eredun, understands the languages of its summoner

Challenge : X

Traits

Whip Master : When the succubus hits a creature with its Lash of Pain, the target can be moved up to 10 feet closer to or away from the succubus.

Actions

Lash of Pain : Melee Weapon Attack; +5 to hit, reach 10 ft., one target. Hit; 1d6 + 3 necrotic or slashing damage, and a creature must succeed on a Constitution saving throw versus its master's spell DC, or have its movement speed reduced by 10 feet till the start of the succubus' next turn.

Shapechanger : The succubus can use its action to polymorph into a Small or Medium humanoid, or back into its true form. Other than its size and speed, its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Invisibility : The succubus magically turns invisible until it attacks, or until its concentration ends (as if concentrating on a spell). Any equipment the succubus wears or carries is invisible with it.

Demonic Core

The demonic core of a succubus resembles... a tube of lipstick? A warlock who carries the demonic core of a nether dragon gains the following benefits:

2nd Level : While carrying a succubus's core, the warlock has advantage on Charisma (Deception) and Charisma (Persuasion) checks. While they hold the core, they can cast the Charm Person spell at will.

5th Level : While holding the core, the warlock knows the Suggestion spell and can cast it without expending a warlock spell slot once per long rest.

9th Level : While holding the core, the warlock knows the Dominate Person spell and can cast it without expending a warlock spell slot once per long rest.

Armor Class : 16 + Proficency Bonus (Natural Armor)

Hit Points : Your warlock level multiplied by the sum of six plus the Voidwalker's Constitution modifier

Speed : 30 ft.

| STR : 16 (+3) | DEX : 8 (-1) | CON : 16 (+3) | INT : 8 (-1) | WIS : 14 (+2) | CHA : 16 (+3) |

Saving Throws : DEX + 1, WIS + 4

Skills : Athletics +5, Intimidation +2, Perception +4

Damage Vulnerabilities : radiant

Damage Resistances : bludgeoning, piercing, and slashing damage from non-magical weapons

Condition Immunity : exhausted, grappled

Senses : darkvision 60 feet, passive Perception 14

Languages : Eredun, understands the languages of its summoner

Challenge : X

Traits

Threatening Presence : Any creature damaged by the voidwalker has disadvantage on any attack roll it makes on a target other than the voidwalker, until the end of the voidwalker's next turn.

Hollowing Void : Whenever the voidwalker takes damage it reduces it by its Constitution modifier. Force, psychic, and radiant damage ignore this feature.

Actions

Slam : Melee Weapon Attack; +5 to hit, reach 10 ft., one target. Hit; 1d6 + 3 bludgeoning damage.

Suffering : Melee Weapon Attack; +5 to hit, reach 10 ft., one target. Hit; 1d6 + 3 necrotic damage.

Shadow Bulwark (1/day) : the voidwalker gains a number of temporary hit points equal to its master's level.

Demonic Core

The demonic core of a voidwalker resembles an orb of pure shadow. A warlock who carries the demonic core of a voidwalker gains the following benefits:

2nd Level : While carrying a voidwalker's core, the warlock has advantage on Wisdom (Insight) and Charisma (Intimidation) checks. While they hold the core, they can cast the Ice Barrier spell at will.

5th Level : While holding the core, the warlock knows the Yogg's Doom spell and can cast it without expending a warlock spell slot once per long rest.

9th Level : While holding the core, the warlock knows the Enervation spell and can cast it without expending a warlock spell slot once per long rest.

Armor Class : 16 (breastplate)

Hit Points : 94 (9d10 + 45)

Speed : 30 ft., fly 50 ft.

| STR : 18 (+4) | DEX : 16 (+3) | CON : 20 (+5) | INT : 14 (+2) | WIS : 16 (+3) | CHA : 22 (+6) |

Skills : Deception +9, Intimidation +9

Damage Resistances : bludgeoning, piercing, and slashing from non-magical weapons

Damage Immunities : fire, poison

Condition Immunities : poisoned

Senses : darkvision 60 ft., passive Perception 12

Languages : Eredun, Common

Challenge : 7 (2,900 XP)

Traits

Pain Master : When the doomguard hits a creature with its whip attack for the first time in a round, the creature must make a DC 14 Constitution saving throw or be struck with crippling pain until the beginning of its next turn. Its speed is reduced to 10 feet and it has disadvantage on attack rolls. If it attempts to cast a spell, it must make a DC 14 Constitution saving throw or the casting fails and the spell is wasted.

Armor Class : 17 (breastplate)

Hit Points : 94 (9d10 + 45)

Speed : 30 ft.

| STR : 20 (+5) | DEX : 8 (-1) | CON : 20 (+5) | INT : 12 (+1) | WIS : 14 (+2) | CHA : 12 (+2) |

Damage Resistances : bludgeoning, piercing, and slashing from non-magical weapons that aren't adamantine

Damage Immunities : fire, poison, psychic

Condition Immunities : charmed, exhaustion, frightened, paralyzed, petrified, poisoned

Senses : darkvision 120 ft., passive Perception 12

Languages : understands Eredun but can't speak

Challenge : 7 (2,900 XP)

Traits

Death Throes : When the infernal dies, it explodes, and each creature within 30 feet of it must make a DC 15 Dexterity saving throw, taking 10 (3d6) fire damage on a failed save, or half as much damage on a successful one. The explosion ignites flammable objects in that area that aren't being worn or carried.

Fire Aura : At the start of each of the infernal's turns, each creature within 5 feet of it takes 3 (1d6) fire damage, and flammable objects in the aura that aren't being worn or carried ignite. A creature that touches the infernal or hits it with a melee attack while within 5 feet of it takes 3 (1d6) fire damage.

Illumination : The infernal sheds bright light in a 30-foot radius and dim light in an additional 30 feet.

Immutable Form : The infernal is immune to any spell or effect that would alter its form.

Siege Monster : The infernal deals double damage to objects and structures.