You have plunged into a pact with the deeps. An entity of the ocean, the Elemental Plane of Water, or another otherworldly sea now allows you to draw on its thalassic power. Is it merely using you to learn about terrestrial realms, or does it want you to open cosmic floodgates and drown the world?
Perhaps you were born into a generational cult that venerates the Fathomless and its spawn. Or you might have been shipwrecked and on the brink of drowning when your patron's grasp offered you a chance at life. Whatever the reason for your pact, the sea and its unknown depths call to you.
Entities of the deep that might empower a warlock include krakens, ancient water elementals, godlike hallucinations dreamed into being by kuo-toa, merfolk demigods, and sea hag covens.
Expanded Spell List
The Fathomless lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you:
| Spell Level |
Spells |
| 1st |
create or destroy water, thunderwave |
| 2nd |
gust of wind, silence |
| 3rd |
lightning bolt, sleet storm |
| 4th |
control water, summon elemental |
| 5th |
Bigby's hand (appears as a tentacle), cone of cold |
Tentacle of the Deep
At 1st level, you can magically summon a spectral tentacle that strikes at your foes. As a bonus action, you create a 10-foot-long tentacle at a point you can see within 60 feet of you. The tentacle lasts for 1 minute or until you use this feature to create another tentacle.
When you create the tentacle, you can make a melee spell attack against one creature within 10 feet of it. On a hit, the target takes 1d6 + your proficiency bonus cold damage, and its speed is reduced by 10 feet until the start of your next turn. When you reach 10th level in this class, the damage increases by 1d6.
As a bonus action on your turn, you can move the tentacle up to 30 feet and repeat the attack .
You can summon the tentacle a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.
Gift of the Sea
Also at 1st level, you gain a swimming speed of 40 feet, and you can breathe underwater.
Oceanic Soul
At 6th level, you are now even more at home in the depths. You gain resistance to cold damage. In addition, when you are fully submerged, any creature that is also fully submerged can understand your speech, and you can understand theirs.
Guardian Coil
At 6th level, your Tentacle of the Deep can defend you and others, interposing itself between them and harm. When you or a creature you can see takes damage while within 10 feet of the tentacle, you can use your reaction to choose one of those creatures and reduce the damage to that creature by 1d6 + your proficiency bonus. When you reach 10th level in this class, the damage reduced by the tentacle increases by 1d6.
Grasping Tentacles
Starting at 10th level, you learn the spell
Evard's black tentacles. It counts as a warlock spell for you, but it doesn't count against the number of spells you know. You can also cast it once without using a spell slot, and you regain the ability to do so when you finish a long rest.
Whenever you cast this spell, your patron's magic bolsters you, granting you a number of temporary hit points equal to your warlock level. Moreover, damage can't break your concentration on this spell.
Unleash the Depths
Starting at 14th level, you gain the ability to call upon your patron for aid. As an action, you choose a point within 30 feet of you where your patron tears through reality, manifesting a measure of its thalassic grandeur. Choose one of the following effects to issue from this manifestation point. Once you use either effect, you can’t use this feature again until you finish a long rest.
Transport. You and up to five willing creatures of your choice that you can see within 30 feet of the manifestation point are grasped by spectral tentacles and yanked through your patron’s realm. The tentacles teleport you and the chosen creatures to a point of your choice within 100 miles that you have visited within the past 24 hours. The tentacles then vanish.
Fury. You can direct a barrage of spectral tentacles to issue forth and strike up to five creatures you can see within 30 feet of the manifestation point. Each target must make a Dexterity saving throw against your spell save DC. On a failed save, the creature takes 10d6 cold damage and is knocked prone. On a successful save, it takes half as much damage and is not knocked prone. The tentacles then vanish.
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