The alignment drop for killing a hostile white unicorn varies depending on initial alignment:

• 6000: 2312 alignment drop
• 4000: 1464 alignment drop
• 3000: 976 alignment drop
• 2500: 3249 alignment drop
• 2000: 12000 alignment drop

On the high end of lawful, the alignment drop decreases as alignment decreases. On the low end of lawful, the alignment drop can be massive, decreasing alignment all the way to C- or N-.