The Eternal

You have made a pact with a powerful Eternal, an entity often more akin to a force than a being. Having no physical form to speak of, the Eternal's power knows neither limit nor agenda. Rarely is an Eternal conscious enough to play favorites or take sides, so gaining the use of one's power is often an accident or result of summoning rituals.

Eternals are extremely powerful, and don't do much to gauge the power they infuse mortals with. The more power one attains from an Eternal, the more difficult to control it becomes. Eternals are deities of pure energy, so one might take the form of a particular magical damage type; i.e. Fire, Lightning, Force, etc.

Powerful Core

At 1st level, the power of the Eternal flows through you enhancing your physical power. You gain your choice of either the Tough feat or a +1 to Constitution. Ability scores cannot exceed 20 using this feature.

+1 to Constitution

Choosing this option will grant you a +1 to your Constitution score, up to a maximum of 20.

Tough feat

Choose this option to gain the Tough feat, which adds 2 to your hit point maximum for each level you have and achieve afterwards.

Channel Eternity

At 6th level, you learn to convert the raw energy of the Eternal flowing through you directly into spells. When you attempt to use this feature, roll a number of d4's equal to the attempted spell's level. You take that damage. Then you must make a Constitution saving throw with save DC equal to 14 + the spell's level - your Warlock level (minimum of 6). On a success, you cast the spell as normal. You cannot cast spells at levels higher than their original level using this feature. You can still expend pacts as usual without triggering the effects of this feature. Use of this feature costs an action.

Eternal Release

At 10th level, you learn how to better Channel Eternity for certain spells by releasing more energy. You gain proficiency in Somatic spells and spells of Fire, Lightning, and Radiant damage types and can use Channel Eternity to cast them at higher levels (up to a maximum of 5th level). In addition, you take only half damage when using Channel Eternity to cast spells of those types (this effect cannot stack; round up each time).

Eternal Adaptation

At 14th level, you have mastered the use of the Eternal's power, and your body has become enhanced further by it. You get +2 to Constitution and your maximum for that score goes up by 2. You also gain proficiency in CON saving throws. In addition your body now ages at a slower rate, adding an additional half of your remaining lifespan to it.