Delta Rune

The Delta Rune is an emblem representing the Dreemurr royal family. It shows an orb between two wings and three triangles beneath it, with the middle triangle inverted.

It is first seen on the Boss Monster's robe in the introduction to Undertale, and secondly seen on Toriel's robe, foreshadowing her role in the story, and the familiar symbol appears in other places.

Symbolism

There is a prophecy. The Angel... The One Who Has Seen The Surface... They will return. And the underground will go empty.

Ancient Glyphs in Waterfall

The Delta Rune is said to symbolize a prophecy that predates written history. However, the original meaning has been lost in time. What is certain is the bottom triangles symbolize the monsters of the underground. The winged circle is believed to represent the "angel," which is prophesized to be the one that has seen the surface and will return one day to depopulate the underground.

This prophecy has two interpretations: one where the "angel" destroys the barrier and brings freedom to the monsters, and one where it is an "Angel of Death" that kills everyone in the Underground.

Dialogue with Gerson

• Oh yeah... The prophecy.
• Legend has it, an 'angel' who has seen the surface will descend from above and bring us freedom.
• Lately, the people have been taking a bleaker outlook...
• Callin' that winged circle the 'Angel of Death'.
• A harbinger of destruction, waitin' to 'free' us from this mortal realm...
• In my opinion, when I see that little circle...
• I jus' think it looks neat! Wahaha!

Gallery

OnceUponaTime.png

The rune's appearance during the game's introduction.

Asgore sprite.png

The wings and orb appear on Asgore's brooch on his cape.

AsgoreFight.gif

...And in battle, it appears on his chest plate.

Toriel.png

The rune is the most prominent feature of Toriel's robe.

Undertale Ruins Gate Outside.png

The rune appears right above the door leading back to the Ruins.

Mysterydoor.png

The rune appears on the Mysterious Door.

Core.png

The crest can be found above some doors in the CORE.

Delta Window.png

In the final corridor, the symbol appears on all of the stained glass windows.

Gerson.png

A variant of the rune can be seen on Gerson's wall.

Snowdinshopkeep.png

Another variant appears in Snowdin's shop on a scroll.

Asriel Dreemur Transformed.gif

Asriel's Second Form in battle, where it can be seen on his robe

Asrielfinalform.gif

Asriel's Third Form in battle, showing much resemblance to the Delta Rune

Undyne (genocide armor).gif

The appearance of Undyne the Undying resembles the Delta Rune (Much like Asriel).

Mettaton NEO.gif

The appearance of Mettaton NEO resembles the Delta Rune (Much like Asriel).

Screenshot-Toriel and Monster Kid at school.png

The symbol appears on the School doors in the True Pacifist Ending Credits.

Finalcorridorbox.png

The Delta Rune appears above the Final Corridor entrance.

MiddleroadpuzzleEmpty.png

The Delta Rune can be seen on few of the doors inside the ruins.

Throne.png

The Throne Room has a throne with the Delta Rune symbol on it.

Froggit.gif

The triangles appear on Froggit's chest.

Lesser Dog.gif

The crest on Lesser Dog's shield in battle.

Royal.png

The rune can be seen on the armor of Royal Guards

FinalFroggit.gif

The triangles appear on Final Froggit's chest, much like Froggit.

Trivia

• "Delta Rune" is an anagram of "Undertale."
• The Delta Rune bears a resemblance to the royal crest of the Zelda series, both with three triangles and a winged figure.
• The prophecy states that when an angel appears, the underground will be empty. This hints at the two main routes to beat the game.

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