Projectiles

Ok i made a teleport in a wall and it looks like a vortex but is the a way to make projectiles come out of it like imp fireballs cacodemon fireballs without have to put monsters behind it?

If you're using ZDoom, you can use Thing_Projectile in a script:

script 1 open
{
   Thing_Projectile (1, T_IMPFIREBALL, 64, random(10, 20), random(-5, 5));
   delay(1);
   restart;
}

This should spawn a imp fireball at mapspot with tag 1, facing south with a random speed and randomly fyling upwards or downwards. Didn't test it though ;)