Your powers are drawn from the endless darkness and the unknowable mysteries of the Deep. These powers are not without cost, however, as the more you delve into the secrets of the Deep, the more you risk losing your sense of self. The Deep is a patient and inscrutable patron, revealing its purpose only in fragments, through cryptic whispers and enigmatic visions.

As you grow in power, your bond with the Deep strengthens, granting you abilities that allow you to perceive hidden truths, command the minds of others, and, ultimately, embody the Deep’s power in a physical form. But with great power comes great danger—every use of the Deep’s gifts brings you closer to the edge of sanity and deeper into its inscrutable designs.

Whispers of the Abyss

Additionally, once per short rest, you can occasionally receive cryptic messages from the Deep.
DM can suggest player to check cards for any messages.

Eyes of the Abyss

see through illusions, invisibility, and into other planes of existence for up to 30 minutes. range 200ft.
This ability can reveal hidden truths or spy on distant locations.

Voice of the Abyss

Channel the overwhelming psychic presence of the Deep through your voice to assault the minds of your enemies. As an action, you can target creatures within 60 feet that can hear you, and 200ft if you have true seeing activated. The target must make a Wisdom saving throw against your Warlock spell save DC.
On a failed save, the target takes 4d8 psychic damage, is frightened(attempts to flee immediately) and is stunned until the end of your next turn. On a successful save, the target takes half damage and isn’t stunned.

Avatar of the Abyss

Transform into an eldritch creature of the deep,
gaining temporary hit points,
advantage on Intimidation checks, and the ability to breathe underwater.