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Keywords are:  'cleric spell conceal alignment'

Spell: conceal alignment        Mana:  37  Wis: 29  Chr: 25  Lvl 27 Cler  (28%)
                                (obscure)   Requires: know alignment
                                Group: Cleric inquisition spellgroup
                                (Can Be Groupcast)

Usage:
cast conceal alignment

'Conceal alignment' allows an evil character to hide his true alignment
from others.  While affected by this spell, the casters alignment will appear
to be neutral when detect evil or know alignment are used.  Note that this
only conceals the external appearance of alignment - ward spells will still
affect the caster.

This spell can only be used by high level evil clerics, and it is said that
only the dark clerics of the drow know enough to teach it.