This hides the caster's alignment aura by covering it with an illusion of an alignment matching another creature's.

This requires a contest of detection/analysis ability vs. the caster's skill with this spell to pierce through the false alignment.

Delude [48] 
    Illusion [23.75] 
        Affects Abilities to Sense and Analyze Moral Alignment [+0%] 
            This is instead of vision and hearing 
        Independence [+40%] 
        Extended Duration (x30) [+60%] 
        Duplicates Alignment of Creature Analyzed [-60%] 
            More clearly, masks the caster's alignment with an illusion 
    Detect (Alignment, Common) [24] 
        Analyzing [+100%] 
        One Analysis Only [-35%] 
    Based on Activation Roll [+5%] 
    Takes Extra Time 2 [-20%] 
    Magical [-10%] 
    Spell Components [-20%] 
        Must say "alignment" in Latin 
        Must gesture with hands 
Levels 2-5 [53/58/63/68] 
    Increase Extended Duration by 1 step [+20%]