The Master Archon

Large celestial, lawful good
STR: 18 (+4)
DEX: 14 (+2)
CON: 20 (+5)
INT: 25 (+7)
WIS: 22 (+6)
CHA: 18 (+4)

Any creature within 60 feet of the Master Archon attempting to use a questionable ability combination found on the internet must succeed on a DC 20 Wisdom saving throw.
On a failure, the Master Archon simply says:
“Show me where it says that in the book.”
The combination immediately stops working.

The Master Archon automatically knows the true results of the players’ dice rolls, even if they are sitting on the other side of the table or have “accidentally” knocked the die with their hand.

If the Master Archon fails a saving throw against player logic that would completely derail the plot, they can instead say:
“Because I said so.”
The Master Archon automatically succeeds.

The Master Archon makes two Disappointed Gaze attacks or one Initiative Slam attack.

Ranged psychic attack: +11 to hit, range 30 ft., one target.
Hit: 4d6 psychic damage.
The Master silently stares at the player who decided to check social media on their phone in the middle of a boss fight.

The Master Archon slams their hand loudly onto the table.
All creatures within hearing range must immediately stop spamming, put away their paladin jokes, and roll a d20.

When a player declares:
“But my previous DM let me jump 100 meters by summoning a goose.”
The Master Archon raises one eyebrow as a reaction.
The effect of the player’s spell or action is canceled, and the player gains the Stunned condition until the end of their turn.

The Master Archon can take 3 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 Master Archon asks this question to a player who is about to do something unbelievably stupid (such as touching a glowing sphere inside a crypt).
The player must succeed on a DC 18 Wisdom saving throw or be forced to reconsider their decision.

The Master Archon slowly and ominously flips through the pages of the Monster Manual, wearing a suspicious grin.
All players have disadvantage on their next attack roll due to the sudden wave of panic.

The Master declares a break.
All player characters instantly regain 1d4 hit points, while the actual players must run to the kitchen.