The Hidden

"You. You're a wretched warlock. Let me guess, you're serving some kind of fiend or horror."

"I... I actually don't really know what I'm serving..."

"Really? You could at least have vaguely understood what it was from appearance, right?"

"No... never saw it, don't even know it's name. It just started speaking to me one day, then gave me magic and a mission..."

Warlocks who serve for creatures hidden to the world are only left to imagine they're patron's appearance and goals, only knowing them from voice, an object or a shapeshifted form. Many of these hidden creatures find their warlocks through dreams or visions during odd circumstances.

 

Rare and Mysterious

Those who encounter a force hidden from all kinds have to grapple with the fact that they themselves don't know this creature's visual appearance or morality, hence why it's rare that people will actually agree to such mysterious beings. Though, some accept their rewards of magic and power for serving them as their eyes and ears in this rapid & changing world, making them Warlocks of the Hidden.

The kinds of creatures that count as the Hidden are largely meant to be unknown, but they can come in multiple forms. They could be a vague voice only heard by warlocks serving them, telling them of their time being in a deep cave or far realm (Either still being there or only recently escaped, your choice). A being in a stuffed toy, machine or locked box from the warlock's childhood talking to them telepathically from within. Or finally, a shapeshifting creature that disguises itself as a man, animal or common monster to converse with the warlock.

Expanded Spell List

The Hidden lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to your warlock list for you.

Spell level                             Spells

1st                                                       Silent Image, Fog Cloud

2nd                                                      Misty Step, Phantasmal Force

3rd                                                       Sending, Erupting Earth

4th                                                       Arcane Eye, Black Tentacles

5th                                                       Cloudkill, Geas

Hidden Senses

Starting at 1st level, your patron has given you a small amount of their abnormal sensing ability to use as a way to see, feel and hear things in ways that no one else around you can. If you choose, you can use up an action to:

-Bring your sight to other parts of your body, such as a hand or knee, to see in tight places that your head can't reach. When you do this, however, you cannot see with your actual eyes until you end the action.

-Attune your hearing senses to the point that you can hear a butterfly's wingbeat, you can use this to hear background chatter or an animal's footsteps. If a really loud noise occurs within 5 feet of you, you take 2d4 bludgeoning damage.

-Understand what you are touching no matter if you can see it or not. You cannot understand the touch of magical creatures or magic items.

Warped Pact Boon

From 6th level, your chosen Pact Boon has been psychically touched by your patron and given unique properties different from most warlocks, changing the Pact Boon to a mysterious appearance.

Pact of the Chain Upgrade:  Your pact of the chain creature initially at 3rd Level can be whatever you want that can be a familiar, but now that creature and any creature you create using this Pact boon has gained unique abilities from your patron. Your familiar gets the ability to mould it's body into tight spaces like keyholes without taking damage or being incapacitated, also it now can choose to incorporate an extra 1d6 psychic damage to any attacks it makes up to three times a day. You familiar's new look may range from a jet black, shadowy appearance to a mutilated, almost diseased version of it.

Pact of the Blade Upgrade:  Your pact weapon suddenly gains some unknown abilities from your patron, changing it to look like it was made out of an odd metal not known by any person and having either be more   smooth or geometric. You can now choose to have your pact weapon rapidly spin around on its own around you or a chosen ally/opponent, each slash from it does the same amount of damage as how you would usually use it with two hands. Additionally, it gains some runes written by your patron on it that makes any opponent hit by it have to make a strength saving throw or be tossed 10 feet away from you.

Pact of the Tome Upgrade:  Your book of shadows have gained some new notes gifted by your patron and written in a font only you can read. These notes contain unique casting for 2 first level spells and one second level spell of your choice from any spell list that be cast once at will, without expending a spell slot. You can get these spells back after a long rest.

Hide & Seek

Starting at 10th level, whenever you need to hide yourself or an object, you gain a mental feeling on where the best hiding spot is at the time, so you roll for stealth checks with advantage. You also gain that same feeling when you need to find something or someone, giving you advantage in perception checks as well. You cannot get that feeling from someone who's invisible but you can get it from someone who's shapeshifted. You can't track out undead with this either.

Warping Self

You gain a great & strong ability from your patron at 14th level, giving you the ability to shape yourself to being akin to its true appearance for about 10 minutes, once per day.

If your patron is a voice in your head, you can use up an action to make one of your arms become giant and monstrous, with large claws and a spiky elbow. This arm of yours can punch an opponent to deal 4d8 bludgeoning damage or claw at the enemy with mental power, dealing 3d10 psychic damage. During this state, you gain large bull horns and a tail, as well as a bellowing voice.

If your patron is in an object, then you become a personification of that object (Toy, machine or box.), with black liquid seeping out of you. You loose your ability to speak but in return you can attack with whip-like black thralls dealing 2d8 slashing damage each. You can also make your opponent seep out that black liquid, if the opponent fails an intelligence saving throw it deals 1d10 psychic damage each turn until healed by another.

If your patron is a shapeshifting being, you become a thick smog with the only human feature being two eyes in the middle of the mass, you also speak in whispers. This smog covers corners and can reach a radius of 20 feet, the smog deals 2d8 psychic damage each turn to anyone in it and your eyes in the middle of the cloud can stare at at an opponent, making them fall prone.