how would i make a beam projectile?

I don't think its possible without custom coding,
for that you will have to make Ray tracing that will be strached until it hits any obstacle

I know Magica and, Wizardry have something like that

Good Python is the best language, Java bad ):

PythonIsCool You have become the very thing you swore to destroy!

Anyone figured out how to do this?

i can't think of anything except to do a stream of projectiles (either with a ranged item with "shoot constantly while active" or in a procedure being repeated) without gravity. then maybe have the projectile have a particle texture.