Appendix H — Psychic Spells

The spells collected here are granted or modified by the Great Old One Warlock’s Psychic Spells feature. The warlock’s patron has quietly rewritten how these incantations are cast and felt: where the originals deal another kind of harm, these deal Psychic damage instead.

There are no mechanical changes beyond the damage type. Ranges, areas, saving throws, durations, components, and effect text all otherwise match the source spell exactly.

Void Shell

Level	Casting Time	Range/Area	Components
1st	1 Bonus Action	Self	V, S, M¹
Duration	School	Attack/Save	Damage/Effect
1 Hour	Abjuration	None	Psychic

Intangible, shadowy tendrils weave a reactive psychic barrier around you. You gain 5 Temporary Hit Points. If a creature hits you with a melee attack roll before the spell ends, the tendrils violently lash into the attacker’s mind, dealing 5 Psychic damage as they taste the creature’s sanity. The spell ends early if you have no Temporary Hit Points.

Using a Higher-Level Spell Slot. The Temporary Hit Points and the Psychic damage both increase by 5 for each spell slot level above 1.

Flavor

Shadows coil up your body, braiding into a shimmering, translucent exoskeleton of violet-black tendrils.
The air pressure drops, accompanied by a faint, rhythmic pulsing sound like a heartbeat underwater.
Nearby loose dust and light debris drift inward, drawn toward the dark energy.
The melee strike sinks into the dark mass, prompting a shadow tendril to lash directly into the attacker’s head with a violet flash.
A dull thud replaces the sound of impact as a wave of vertigo and sharp mental pain pierces the attacker’s mind.
The attacker staggers backward, eyes wide and disoriented from the sudden psychic shock.

Source: Player’s Handbook, pg. 243

https://www.dndbeyond.com/spells/2618870-armor-of-agathys modified by the Great Old One Warlock Psychic Spells feature.

¹ a shard of blue glass

Screaming Maelstrom

Level	Casting Time	Range/Area	Components
2nd	1 Action	60 ft. (5 ft. Cube)	V, S, M¹
Duration	School	Attack/Save	Damage/Effect
Concentration 1 Minute	Conjuration	None	Psychic

You tear open a localized breach to the void, conjuring a 5-foot Cube of maddening psychic static centered on a point within range. The space inside the Cube violently fractures reality, flooding the minds of those caught within with the screaming alien thoughts of cosmic horrors.

A creature in the area takes 4d4 Psychic damage. A creature also takes this damage if it enters the Cube, ends its turn there, or if the Cube moves into its space. A creature takes this damage only once per turn.

On your later turns, you can take a Magic action to snap the breach shut and reopen it elsewhere, moving the Cube up to 30 feet.

Using a Higher-Level Spell Slot. The damage increases by 2d4 for each spell slot level above 2.

Flavor

The Cube appears to be missing chunks of reality. Light passing through it bends as though warped by an unseen dark star. In its center, the space seems impossibly deep, as though looking down an infinite dark shaft lined with mirrors at non-Euclidean angles.
Those inside the zone are forced to process frequencies from outside known existence. It sounds like the static of the void mixed with grinding stones and screaming voices speaking dead tongues at an unnatural, dizzying speed.
Victims suffer brain hemorrhaging under the weight of information mortal minds weren’t built to hold. They grasp their heads in pure agony; blood streams from their noses, ears, and under their fingernails as they claw at their own skulls, transfixed by brief glimpses of cold stars and ancient leviathans.

Source: Player’s Handbook, pg. 251

https://www.dndbeyond.com/spells/2618974-cloud-of-daggers modified by the Great Old One Warlock Psychic Spells feature.

¹ A sliver of glass.