I was talking with some friends about how my deeply held belief is that Warlock invocations are primarily to be used for shenanigans, rather than taking the ones with an obvious and simple combat application. This got me thinking about it, and I came up with some extra ones. Sadly, I could not figure out how to make all the additions awesome utility fun.

Some of these probably also need a level restriction, but I’m mostly assuming those are harder to make use of at low level anyway so it may be fine.

Changeling

Prerequisite: Archfey patron and one of Mask of Many Faces or Master of Myriad Forms

Onlookers have disadvantage on checks to see through your disguises (magical or mundane). Dispel magic attempts against you do not automatically remove disguise self or alter self, but must instead roll as if targeting a spell higher than the slot level of dispel magic, and this roll has disadvantage. You gain advantage on Charisma (Deception) rolls to pretend to be someone you are disguised as.

Glamour Weaving

Prerequisite: Archfey patron and Misty Visions

You gain the ability to concentrate on an additional spell, as long as that spell is of the Illusion school.

Gossamer Blade

Prerequisite: Archfey patron and Pact of the Blade feature

Your pact weapon is partly ephemeral, spun of solidified glamour. You may expend a pact magic slot as a bonus action. Until you cancel the effect as a free action on your turn, or until you take a short or long rest, your attacks with your pact weapon glide easily through armor and rend the mind and soul.

While this effect is active, your pact weapon deals psychic damage instead of its normal damage type, and instead of making an attack roll, targets of your attacks must make a Dexterity saving throw against your spell save DC (taking your weapon damage on a failed saving throw and half damage if successful). Targets must still be within reach of your melee attacks.

Additionally, while in this state, your pact weapon can cleave through illusions. If the creature that is the target of your attacks is under the effects of an illusion spell, or if you use an action to strike an illusion that is not anchored on a creature, apply the effects of casting dispel magic against any illusion effects present (at the level of your pact magic slot); this does not expend an additional pact magic slot or require you to be able to cast dispel magic. Rather than simply ending, an illusion dispelled in this way generally responds as if it was physically destroyed by the attack.

Oathkeeper

Prerequisite: Archfey patron and Pact of the Chain feature

When you make a deal with a willing subject (not magically compelled or under physical duress), you can cast geas on the subject at will, without expending a spell slot. The instructions for the geas must be the terms of the deal, and the casting time of the spell can be lowered to 1 action if at least a minute was spent working out the deal. You can’t do so again until you finish a long rest.

Book of Names

Prerequisite: Archfey patron and Pact of the Tome feature

Your Book of Shadows includes pages for signatures. If you can get a willing subject (not magically compelled or under physical duress) to sign their full name in the book, you have power over that individual. You have advantage on spell attacks against the subject, and the subject has disadvantage on saving throws against your spells and other magical effects. You may choose to willingly strike out a name, losing power over the subject.

Brand of Shared Sight

Prerequisite: Fiend patron and one of Devil’s Sight or Witch Sight

As an action, you may press your thumb to the brow of a willing subject and deal 2 fire damage, marking the subject with a small sigil that represents your patron. Whenever you are in a position where you can see the subject, the subject can share any forms of enhanced vision you possess (e.g., darkvision, Devil’s Sight, truesight, Witch Sight, etc.). You may maintain this effect on as many subjects as you desire, but it ends whenever the subject has maximum hit points (i.e., has healed the damage from the brand).

Blood Protection

Prerequisite: Fiend patron and Fiendish Vigor

Whenever your temporary hit points are reduced to 0, you gain resistance to the damage type that removed your last temporary hit point. This does not apply to the attack that removed the temporary hit points, but does apply to subsequent attacks. This resistance ends when you take a short rest, are restored to maximum hit points, or have a new set of temporary hit points removed by a different damage type (that becomes your new resistance).

Hellfire Blade

Prerequisite: Fiend patron and Pact of the Blade feature

As a bonus action, you can cause your pact weapon to switch from a physical object to coruscating flame. While in this form, the weapon deals fire damage instead of its normal type (bludgeoning, piercing, or slashing). You can change back to a physical weapon as an additional bonus action.

Soulbinder

Prerequisite: Fiend patron and Pact of the Chain feature

You may write a contract for a subject’s soul that must be signed in blood by you and the subject (who must not be magically compelled or under physical duress). If you successfully upheld your responsibilities in the contract, when the subject dies, the contract is immediately imbued with their soul, which you can free, use, or trade as you wish. Creating a contract automatically fails if the subject does not have a soul, or if the soul is already spoken for in another contract.

Shadow Ledger

Prerequisite: Fiend patron and Pact of the Tome feature

Your Book of Shadows includes pages for accounting of debts. Any debts you owe or are owed automatically appear in these pages (and this can inform you of verbal agreements or agreements made by proxies of which you were not aware). Additionally, you may store wealth in an extradimensional space associated with the book. The inside back cover of the book includes a pocket that opens into a Bag of Holding which can only store coins, gems, or art objects.

Psychic Driving

Prerequisite: Great Old One patron and Gaze of Two Minds

You may use a bonus action to maintain Gaze of Two Minds instead of an action (but you are still blinded and deafened to your own surroundings). Whenever you are using Gaze of Two Minds, you can treat the subject as your familiar, communicating with them telepathically and allowing them to deliver spells with a range of touch if they are within 100 feet of you.

Additionally, while you are maintaining Gaze of Two Minds or have a thrall from the Create Thrall ability, if you have more than twice the hit dice of the subject and are within 100 feet, you may attempt to possess them. You may force a contested Charisma check with the subject as your action. Once you have succeeded on three of these checks, you and the subject swap bodies. Treat both of you as possessing the other’s body as per the magic jar spell (and you no longer need to spend actions to maintain Gaze of Two Minds). Treat the spell as cast at a level of your highest pact magic or mystic arcanum slot if either of you is subjected to dispel magic. If the effect is dispelled, or you voluntarily end it as a free action, you both return to your original bodies. If either body is currently dead, the effect cannot be dispelled or voluntarily ended (i.e., the living body is permanent possessed by the wrong mind).

Impossible Sight

Prerequisite: Great Old One patron and one of Eyes of the Rune Keeper, Eldritch Sight, or Visions of Distant Realms

You can cast see invisibility at will, without expending a spell slot or material components. Additionally, you may use an action to roll Intelligence (Investigation) contested by the target’s Charisma (Deception) to determine if a target you can see is charmed or possessed.

Abhorrent Weapon

Prerequisite: Great Old One patron and Pact of the Blade feature

Your pact weapon is somehow wrong for this plane of existence, made of strange (possibly living) materials or impossible angles. Sane individuals have trouble focusing on it, making it hard to defend against your attacks. Spend a pact magic slot to gain advantage on all attack rolls with your pact weapon. This ends when you regain your pact magic slots. At the GM’s option, this may not work against targets that are mad or mindless (particularly aberrations, constructs, oozes, plants, and undead).

Subconscious Whispers

Prerequisite: Great Old One patron and Pact of the Chain feature

You can cast command at will as a 1st-level spell, without expending a spell slot. You must be in telepathic communication with the target of the spell.

Necronomicon

Prerequisite: Great Old One patron and Pact of the Tome feature

Your Book of Shadows is protected by a glyph of warding containing the confusion spell, which is triggered by anyone not devoted to the Great Old One attempting to read the book, uses your spell save DC, and resets automatically whenever it is triggered or dispelled. Additionally, when you gain your 5th level pact magic slot, you automatically learn contact other plane as a bonus Warlock spell and have advantage on the Intelligence saving throw involved in that spell.

Divine Protection

Prerequisite: Celestial patron and Armor of Shadows

You can cast sanctuary and shield of faith without expending a spell slot or material components.

Angel’s Wings

Prerequisite: Celestial patron and Ascendant Step

You can cast fly on yourself at will, without expending a spell slot or material components.

Angelic Weapons

Prerequisite: Celestial patron and Pact of the Blade feature

As a bonus action, you can cause your pact weapon to switch from a physical object to brilliant light. While in this form, the weapon deals radiant damage instead of its normal type (bludgeoning, piercing, or slashing). You can change back to a physical weapon as an additional bonus action.

Steed of the Faithful

Prerequisite: Celestial patron and Pact of the Chain feature

You can cast find steed at will without expending a spell slot. The steed replaces your familiar, and vice versa.

Holy Book

Prerequisite: Celestial patron and Pact of the Tome feature

You can cast ceremony at will from your Book of Shadows without expending a spell slot or material components.

Additionally, planar ally, conjure celestial, holy aura, and gate are added to the Warlock spell list for you as options for your mystic arcana.