Detect evil is a level 1 clericspell. When cast, it will apply a long-lasting buff that shows you a red aura around evil creatures. Though it can give you an idea which mobiles you can kill to improve your alignment, it is overall not very useful.

Syntax      : cast 'detect evil' [self-only]
Type        : Detection
Accumulative: No
Duration    : Yes
Casting     : Normal
Position    : Standing
Level       : Level 1
Class       : Cleric
Min. Mana   : 5

Example: > cast 'detect evil'

This spell can be learned from:

Guild	Sessions
Forlond Cleric Guild	8
Harlond Cleric Guild	5
Lórien Cleric Guild	8
Minas Brethil Cleric Guild	8
Rivendell Cleric Guild	8

Spells
Cleric	Bless · Blindness · Break Door · Breath of Briskness · Create Food · Create Water · Cure Blindness · Cure Critic · Cure Disease · Cure Light · Cure Serious · Curse · Darkness · Detect Evil · Detect Poison · Dispel Evil · Divination · Energy Drain · Fear · Harm · Heal · Poison · Protection From Evil · Remove Curse · Remove Poison · Sanctuary · Sense Life · Smother · Strength · Summon · Transfer · Word of Recall
Mage	Armour · Block Door · Burning Hands · Call Familiar · Call Lightning · Charm · Chill Touch · Colour Spray · Control Weather · Create Light · Detect Invisibility · Detect Magic · Dispel Magic · Earthquake · Enchant · Find the Path · Fireball · Identify · Lightning Bolt · Locate · Locate Life · Locate Magic · Magic Blast · Magic Missile · Night Vision · Portal · Scry · Shield · Shocking Grasp · Shroud · Silence · Sleep · Store · Teleport · Ventriloquate · Watch Room
Shaman	Black Breath · Hold · Raise Dead
Special	Create Focus