The Monstrous One

Your patron is The Monstrous One, an ancient being responsible for unleashing monstrosities unto the world. The Monstrous One's motivations for doing so are unknown, but his creatures have wreaked havoc on society for generations.

Expanded Spell List

Expanded Summoner Spells

Spell Level	Spells
1st	arms of hadar, find familiar
2nd	find steed, web
3rd	summon lesser demons, conjure animals
4th	summon greater demon, evards black tentacles
5th	conjure elemental, insect plague
6th	conjure fey
7th	conjure celestial

Bestial Tattoos

You may choose 1 Monstrosity whose Challenge Rating is a maximum of half your Warlock level (rounded down, minimum of 1/2). This creature is tattooed onto your flesh. 

Your total number of Bestial Tattoos is equal to your Warlock level. 

Monstrous Summoning

Starting at 1st level, you may speak the name of one of your Bestial Tattoos. The spoken creature erupts from your tattoo, forming in a space you can see within 10 ft of you. The summoned creature immediately enters the initiative order and follows your commands to the best of its ability. When defeated or after 10 minutes, whichever occurs first, the creature returns to its Bestial Tattoo form, leaving no physical body behind.

Summoning a creature in this way takes a heavy toll on your body. Roll a number of d6 equal to the creature's Challenge Rating (minimum of 1) and reduce your Current Hit Points by that amount. Only one creature may be summoned at a time, if a second creature is summoned the previous immediately disappears.

You may use this feature a number of times equal to your CHA modifier, regaining expended uses on a Short or Long Rest.

Friend to Monsters

Starting at 6th level, you can cast the spell Charm Monster as a 4th level spell. You can do this once per Long Rest and it counts as a Warlock spell for you.

Casting Charm Monster using this feature does not expend a spell slot. 

Monstrous Visions

Starting at 10th level, you cast monstrous hallucinations into the minds of your enemies. As an action, creatures that you can see within 60 feet of you must make a Wisdom saving throw against your warlock spell save DC. On a failed save, it is frightened of you and your allies for 1 minute or until your concentration is broken (as if you are concentrating on a spell). This effect ends early if the creature takes any damage.

Until the hallucination ends, the creature sees monstrosities in every direction, the appearance of which you choose. The creature can see only itself, you, and the monstrous hallucinations.

You must finish a Long Rest before you can use this feature again.

Bestial Exchange

Starting at 14th level, you channel the power of your patron to turns the tides of battle in your favor. As an Action, you can trade in your own life force to summon an especially powerful monstrosity to aid you and your allies. 

You may expend two Monstrous Summoning slots to conjure a Monstrosity whose Challenge Rating is equal to your Warlock level. All other rules from the Monstrous Summoning feature apply to this creature.

The physical toll of summoning such a creature causes you to suffer one level of Exhaustion at the time the monstrosity is conjured.

You must finish a Long Rest before you can use this feature again.