Echoes of the Depths

You cause the sounds and visuals of the depths to consume the minds of up to 10 creatures of your choice that you can see within range. Each creature finds themselves in complete darkness, feeling the weight of water and its crushing pressure on their bodies, as they believe themselves to have been dragged to the deepest, darkest depths of the sea.

The spell replicates sound, temperature, pressure and other stimuli, and a creature affected by this spell suffers the following effects:

• The creature is blinded and deafened.
• The creature takes 6d6 psychic damage at the start of each of its turns, which it perceives as bludgeoning damage from the immense water pressure. Creatures that are immune from the effects of water pressure are immune to this effect.
• The creature must hold its breath or begin suffocating immediately. As such, the creature cannot breathe, speak or cast spells that require vocal components. Creatures with the ability to breathe underwater are immune to this effect.
• The creature’s movement speed is halved, and it has disadvantage on melee weapon attacks with weapons that aren’t daggers, shortswords, javelins, spears or tridents. Creatures with a swimming speed are immune to this effect.

A creature that is affected by this spell can use its action on its turn to make an Intelligence (Investigation) check against your spell save DC, discerning the illusion for what it is on a success, and ending the spell’s effects.