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At 1st level, you have struck a bargain with an otherworldly being of your choice: the Fiend, which is detailed at the end of the class description, or one from another source. Your choice grants you features at 1st level and again at 6th, 10th, and 14th level.

Your arcane research and the magic bestowed on you by your patron have given you facility with spells. See Spells Rules for the general rules of spellcasting and the Spells Listing for the warlock spell list.

You can breathe air and water.

You are immune to poison damage and the poisoned condition.

Any creature that grapples you or otherwise comes into direct contact with your skin must succeed on a DC 12 Constitution saving throw or become poisoned for 1 minute. A poisoned creature no longer in direct contact with you can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. You can also apply this poison to any piercing weapon as part of an attack with that weapon, though when you hit the poison reacts differently. The target must succeed on a DC 12 Constitution saving throw or take 2d4 poison damage.

Your long jump is up to 25 feet and your high jump is up to 15 feet, with or without a running start.

If you fail to immerse yourself in water for at least 1 hour during a day, you suffer 1 level of exhaustion at the end of that day. You can recover from this exhaustion only through magic or by immersing yourself in water for at least 1 hour.

You gain a swimming speed of 40ft and you can breath underwater.

You can use your action to create a pact weapon in your empty hand. You can choose the form that this melee weapon takes each time you create it. You are proficient with it while you wield it. This weapon counts as magical for the Purpose of overcoming Resistance and immunity to nonmagical attacks and damage. Your pact weapon disappears if it is more than 5 feet away from you for 1 minute or more. It also disappears if you use this feature again, if you dismiss the weapon (no action required), or if you die. You can transform one Magic Weapon into your pact weapon by performing a Special ritual while you hold the weapon. You perform the ritual over the course of 1 hour, which can be done during a Short Rest. You can then dismiss the weapon, shunting it into an extradimensional space, and it appears whenever you create your pact weapon thereafter. You can’t affect an artifact or a sentient weapon in this way. The weapon ceases being your pact weapon if you die, if you perform the 1-hour ritual on a different weapon, or if you use a 1-hour ritual to break your bond to it. The weapon appears at your feet if it is in the extradimensional space when the bond breaks.

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

You have advantage on Constitution saving throws that you make to maintain your concentration on a spell.

You have honed your proficiency with particular skills, granting you the following benefits: -Increase one ability score of your choice by 1, to a maximum of 20. -You gain proficiency in one skill of your choice. -Choose one skill in which you have proficiency. You gain expertise with that skill, which means your proficiency bonus is doubled for any ability check you make with it. The skill you choose must be one that isn't already benefiting from a feature, such as Expertise, that doubles your proficiency bonus.

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 1d8 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 to 2d8. 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 qual to your proficiency bonus, and you regain all expended uses when you finish a long rest.

You gain a +1 bonus to AC and saving throws while you wear this cloak.