You have made a pact with a Storyteller from an alternate existence who calls himself Dungeon Master, a being whose aims are to just tell a damn good story, even at the cost of the entire world. Such beings desire interest from all things, you were the most interesting. Mystic Storytellers are powerful enough to control the very makings of the world. On does not make a pact with a Storyteller, a Storyteller forges a pact with you.

Plot Armor

Starting at 1st level when you would take damage from a weapon attack or spell, there is a 10% chance that the Mystic Storyteller will redirect all incoming damage to a different random party member.

 

At Higher Levels you gain an increased chance to redirect damage. 25% at 6th level, 40% at 10th level, and 50% at 14th level.

Dramatic Comeback

Starting at 6th level, you can call on your patron to alter fate in your favor. When you die this feature gives you a 30% chance to instantly revive with a dramatic entrance, but at the cost of half of your Warlock levels (minimum 3). 

At higher Levels, you gain an increased chance to instantly revive. 40% at 10th level, 60% at 14th level, and 80% at 20th Level

Hero's Training

Starting at 10th level you gain one proficiency of your choice immediately. Then you can slowly gain proficiencies. Whenever you attempt to use a weapon, skill, language, or tool you are not proficient in, upon a successful attack, or check gain a charge in that weapon, skill, language, or tool. At three charges you can add 1/3 of your proficiency bonus to that weapon, skill, language, or tool. At six charges you can add 1/2 of your proficiency bonus to that weapon, skill, language, or tool. And finally, at nine charges you become proficient in that weapon, skill, language, or tool.

Language Proficiency

Learn one language of your choice.

Skill Proficiency

Gain proficiency in one skill of your choice.

Tool Proficiency

Gain proficiency in one tool of your choice.

Weapon Proficiency

Gain proficiency in one weapon of your choice.

Edit

Using your pact with the Mystic Storyteller at 14th level, you now gain the power to edit the world around you. As an action, you can change one aspect of the known world, so long as this change does not directly affect another living creature. For example, you can change poisonous air into breathable air, or you can turn water into ice or vice versa. Only a wish spell can revert the changes before the effect ends. This change lasts for a number of hours equal to your charisma modifier, unless you choose to use a Warlock spell slot to change the amount of time allotted to a number of days equal to your charisma modifier.

Once you use this feature, you can't use it again until you finish a long rest.