The Dungeon Master

Other warlocks settle for making pacts with fey, demons, or unfathomable creatures. You however, gain your power from the most powerful entity ever: the dungeon master. Nothing that you can fathom is truly outside of the realm of possibility. However, the whims of your ephemeral patron may put you in danger just as easily.

Expanded Spell List

The Fiend 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	cure wounds, command
2nd	enlarge/reduce, see invisibility
3rd	fireball, animate dead
4th	conjure minor elementals, polymorph
5th	geas, legend lore

DM's Discretion

Starting at 1st level, when you make an attack roll, if your last attack roll failed, and no other player has seen the dice result, you may treat that roll as a non-critical success. 

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

Hilarious Accidents

Starting at 6th level, the reality-warping powers of your patron seem to cause excessive harm to your foes. When a creature rolls a natural one when making an attack roll or skill check against you, treat that roll as if you had made that roll against that creature.

It Just Makes Sense

Starting at 10th level, your freakish luck and reality bending powers allow you to attempt feats never before thought possible. When you make a roll, before you see the result you may choose to designate the roll as a flex. If you make a flex roll, treat every success as a natural 20 and every failure as a natural 1. 

Once you use this feature, you may not use it again until you finish a short or long rest.

Oh, Wait, Actually...

Starting at 14th level, you gain limited control over the monsters that you face from your patron. Whenever you roll for initiative, you may replace one monster that rolled for initiative with challenge rating equal to or lower than your warlock level with another monster with challenge rating equal to your warlock level minus 1d12. The new monster rolls its own initiative, and you don't get XP for the monster that you replaced. 

Once you use this feature, you may not use it again until you finish a long rest.