magik is to cause changes in conformity to my will.
some people think that will refers to the "ego" will and not to the divine will.
there is a pastor in california (wiley drake) that is practicing an interesting form of black magick that seems to be in alignment with the bible. it is called imprecatory prayer. with it, you pray to cause death to others, to cause misery and ill and all sorts of evil.
this pastor had a radio interview to encourage people to practice this prayer so that president obama dies.
littlegreenfootballs.com/article/33885_Wiley_Drakes_Imprecatory_Prayer
here is the definition of this type of prayer...
www.bible.ca/ef/expository-psalm-35.htm
there is something that can be similar in thelema. in the book of the law...
"I will give you a war-engine." Ch III v.7
"With it ye shall smite the peoples; and none shall stand before you". Ch III v.8
"These slay, naming your enemies; & they shall fall before you". Ch III v.26
...so on and so forth.
in thelema it's ok to eliminate your enemies, you may be forced to kill if necessary if someone opposes your true will. but i think the real difference between that pastor and a true thelemite is the understanding of true will as a form of the divine. the pastor is acting on the basis of separation and fear. he is a coward as far as i can see. and in no way in alignment with the divine.
a thelemite forced to kill would do it as the very very very last resource with the understanding that every man and every woman is a star, and this would bring heavy karma upon hirself.