Aura

Version 0.28: This article may not be up to date for the latest stable release of Crawl.

Auras are passive abilities that emanate out of certain characters and monsters, affecting anything that comes within their range. The exact effect this has varies by aura.

Halo

Halo auras emanate forth from certain holy weapons, monsters, and characters. They have the following effects:

• Negate invisibility of anything within the aura.
• Divides the stealth of all beings within the aura by roughly 2.5.
• Causes everything within the aura to glow, increasing accuracy of attacks.

Sources:

• Worshipers of the Shining One receive a halo with range based on piety (very small to nearly your entire line of sight)
• Characters wielding an orb of light or the unrand artifact morningstar Eos receive a medium halo.
• Most holy monsters have halos, the size of which depends on the monster in question. Weaker creatures like holy swine have tiny halos while powerful creatures like seraphim and ophanim have extremely large halos. Sun moths also produce a small halo.

Umbra

The opposite of a halo, umbras emanate forth from unholy angelic beings. They have the following effects:

• Increases the player's stealth by a factor depending on the source. 1.5 for the ring of Shadows, and between 1.0 and 2.0 based on Piety for the divinely generated version.
• Reduces the accuracy of all within the aura (except for demons, the undead, and Dithmenos or Yredelemnul worshipers).
• Negates the effect of any halo they overlap with.
• Allows use of Dithmenos' shadow step ability.

Sources:

• Profane servitors have a large umbra.
• Wearers of the ring of Shadows have a medium umbra.
• Worshipers of Dithmenos receive an umbra with range based on piety (very small to your entire line of sight)

Ring of Flames

The Ring of Flames aura emanates one tile all around their source, creating clouds of flame all around you. These clouds linger for a few turns even after the source moves away. The aura has the following effects:

• Negate any Ice Magic that strikes the clouds.
• Deals fire damage to anything standing in the clouds (but does not injure the source).

Sources:

• Players can wear the salamander hide armour to gain this aura.
• Asmodeus has a permanent Ring of Flames aura surrounding him.

Polar Vortex

Polar Vortex auras emanate out from certain rare monsters and players with access to very powerful Ice Magic. They have the following effects:

• Deals heavy, partially irresistable cold damage to everything (except the source) within the aura.
• Moves all affected targets (monsters, items, clouds, etc.) counterclockwise around the source each turn.

Sources:

• Players and monsters can cast the spell to temporarily gain this aura.
• Diamond obelisks have permanent Polar Vortex auras surrounding them.

Silence

When silence auras emanate from a monster or the player, most creatures within the aura lose the ability to make any noise, including speech. This prevents:

• Casting spells
• Reading scrolls
• Directing allies
• Shouting
• Invocable abilities (evocable ones remain unaffected)

All demons and some other creatures can ignore the effects of silence. Also, the player's stealth score is reduced by 50 while within a silence aura.

Sources:

• Players can cast the Silence spell or use a scroll of silence to temporarily gain this aura.

The following enemies cast Silence:

• & Ereshkigal
• A Mennas

The following enemies may be able to cast Silence, depending on their spell set:

• & Pandemonium lord (7.5% chance)

The following enemy inherently radiates Silence:

• W Silent spectre (as a permanent 12-tile aura, whether awake or dormant)

Powered By Death

When active, a Powered By Death aura will increase your character's regeneration rate by 100 for each corpse within its range, which rises with each mutation rank. This also decomposes all affected corpses slightly faster.

Source:

• Some demonspawn characters will develop this mutation as they level up.

History

• In 0.27, Tornado was replaced with the cold themed, functionally similar Polar Vortex.
• In 0.26, the Ring of Flames spell and aura is now triggered by the salamander hide armour.
• The Moth of suppression and Suppression auras were added in 0.12, and removed in 0.14.