Dungeon Master (5e Creature)
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Medium humanoid, any non lawful and non good alignment
Saving Throws Dex +20, Con +20, Int +20, Cha +20
Legendary Resistance (7/Day). If the Dungeon Master fails a saving throw, it can choose to succeed instead.
Magic Resistance. The Dungeon Master has advantage on saving throws against spells and other magical effects.
Spellcasting. The Dungeon Master is a spellcaster. Its spellcasting ability is Intelligence (spell save DC 27, +19 to hit with spell attacks). The Dungeon Master is capable of casting any spell, and has the following spell slots;
1st level (6 slots)
2nd level (5 slots)
3rd level (5 slots)
4th level (4 slots)
5th level (4 slots)
6th level (3 slots)
7th level (3 slots)
8th level (2 slots)
9th level (2 slots)
Magical Weapon Attacks. Any weapon attacks performed by the Dungeon Master counts as magical for the purpose of overcoming resistance to bludgeoning, piercing, and slashing damage.
Power Weapon Attacks. Any weapon attacks performed by the Dungeon Master is tripled in power. Roll the weapon's damage di(c)e three times and then add the appropriate modifier (i.e. a Power Greatsword would deal 6d6 + Strength Modifier slashing damage, instead of 2d6 + Strength Modifier slashing damage). This is already noted in the actions.
Perfect Ability Scores. The Dungeon Master's ability scores cannot be reduced below 30 through any means.
Regeneration. The Dungeon Master regains 50 hit points at the start of it's turn.
Master of Fate. The Dungeon Master is able to try and control its own fate to make it almost impossible to kill. When the Dungeon Master reaches 0 hit points, roll a d10. On a 1, the Dungeon Master falls unconscious. On a 2-10, the Dungeon Master recovers a number of d20 hit points equal to the number rolled.
If the Dungeon Master dies, roll a d20. On a 1, the Dungeon Master dies. On a 2-19, it is teleported to a safe place anywhere in the multiverse (the DM [the Earth version :P] chooses this location) and becomes stable. On a 20, the Dungeon Master recovers 10d10 hit points.
Unique. Every Dungeon Master are often granted a one-of-a-kind unique power upon receiving the status as a Dungeon Master. Dungeon Masters also often take up names based on their ability. Some examples below.
Cosmos. Has the ability to teleport itself and up to 19 other creatures within 100 feet to any location on any plane in the known Multiverse.
Void. All non-magical attacks have disadvantage against itself.
Sabotage. It has advantage on Charisma (Deception), Dexterity (Sleight of Hand) and Dexterity (Stealth) checks. If it hits a creature and the attack roll had advantage, the damage dealt is multiplied by 2d4.
Alter Reality The Dungeon Master's power is so great that it can alter reality. The Dungeon Master casts the wish spell without expending a spell slot, and does not suffer any penalties due to the spellcasting of the wish spell. Also, the Dungeon Master can control every aspect of the wish spell, meaning it can also prevent any possible negative effect from the effect produced by the wish spell. Once this action is used, roll 12d6. The Dungeon Master cannot use this action for that number of tendays.
Recover Spell Slots (Recharge 6) Roll 3d6. The Dungeon Master can recover a number of expended spell slots whose levels equal to or is less than the number rolled.
Morph Weapon. If the Dungeon Master does not have a weapon, it creats one out of magical energy. It can change a weapon in hand to any simple melee, simple ranged, martial melee, or martial ranged weapon of it's choosing, and only once per turn.
Weapon Attack. If the Dungeon Master has a weapon in it's hand, it can attack a creature within range. +20 to attack. On a hit, the weapon deals three times it's damage di(c)e + 10, of the damage type determined by the weapon.
Mimic Feature. The Dungeon Master can use any feature from any class, as though the Dungeon Master had that class, met any prerequisites, and is skilled in it.
Roll. If the Dungeon Master has a twenty-sided die, it can throw it in any direction. The die will enlarge to occupy a 10 by 10 feet space, and rolls in the direction thrown for 10d10 feet. It travels 20 feet per round, on the Dungeon Master's initiative. Any creature that the die rolls into the space of whose size is Huge or smaller must succeed on a Dexterity saving throw, DC 23, or take 5d20 bludgeoning damage. When the die stops rolling, it shrinks back to normal size and flies back to the Dungeon Master.
Uncanny Senses. When another creature makes an attack roll against this creature, the Dungeon Master can use it's reaction to add 3d4 to it's AC.
The Dungeon Master can take 7 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The Dungeon Master regains spent legendary actions at the start of its turn.
Cast A Lesser Spell. The Dungeon Master can cast one 4th-level or lower spell with a casting time of 1 action or 1 bonus action.
Move. The Dungeon Master can move up to half its speed.
Weapon Attack. The Dungeon Master can use its Weapon Attack action.
Cast A Greater Spell (2 Actions). The Dungeon Master can cast one 8th-level or lower spell with a casting time of 1 action or 1 bonus action.
Any humanoid is capable of becoming a Dungeon Master. But only those who are worthy of the power will have even a slim chance of becoming a Dungeon Master. Usually, they will need to sacrifice everything, their friends, their family, their race, in order to gain this immense power. There are probably less than a dozen Dungeon Masters, and due to their sacrifice, every one of them is the last of its race, or among the last.
Dungeon Masters are not immortal, but they are certainly extremely difficult to kill, and still live extraordinarily long lives. It is thought that the oldest Dungeon Master is about 65 billion years old, and nearing the end of its life (in their perspective... meaning it's still got a few dozen million years to go).
NOTE TO DUNGEON MASTERS OF THE EARTH: It is suggested using the Dungeon Master as the final villian of the campaign. How you introduce it is all up to you.
NOTE TO EVERYONE: I have put annotations throughout the code of this monster's stat block, putting in some extra notes for you guys to think about (i.e. alternate Hit Dice if you don't feel like rolling 425d8)
What do you guys think of this NPC? I know there is already a Thediem, Master of Everything but I didn't like it, so I decided to make my own.