The Engine

You are a sailor on a ship driven by a magical engine. You work as a conduit for the engine, it is your job to maintain the engine and to act as the ships physical. You channel the magic of the engine through yourself and the parts built into you. 

Expanded Spell List

The Engine 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.

Fiend Expanded Spells

Spell Level	Spells
1st	absorb elements, create or destroy water
2nd	aganazzar's scorcher, scorching ray
3rd	fireball, haste
4th	control water, fabricate
5th	cloudkill, telekinesis

Overflow Dump

Starting at 1st level, if you are within 30 ft. of your patron ship at the start of your turn, you gain temporary hit points equal to your Charisma modifier + your warlock level (minimum of 1).

Pressure Valve

Starting at 6th level, you gain the ability to release the pressure of the engine through yourself. As an action on your turn you can expend a number of hit points or temporary hit points to release a 20 ft. cone of steam from yourself. All creatures caught in the cone must make a Constitution saving throw, using your Spell Save DC. The targets take 1d6 fire damage for every four hit points and temporary hit points spent, on a failed save or half that on a successful save. 

Feedback

Starting at 10th level, you can feed power back into the engine. As a bonus action you can spend a number of hit points or temporary hit points to move your patron ship an equal amount of feet forward.

Overclock

Starting at 14th level, you can use the power of the engine to overclock yourself. As a bonus action on your turn you can spend 40 hit points to cast haste on yourself for its full duration without it requiring concentration.