damn, its a bit of a bitch to explain it all...
I have a map (Survival Chaos) where i made lasers, you can check Draenei Tower or Gnome ranged units to see how it looks in game.
No coding needed!!!!
1) Simpler way. You need good missile. I used... dafuq where is Mystic??? Found him, he changed name to Vinz...
You need to STEAL his void missiles.
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I think i used "Spear" one. If you have minimal modeling skills, you can change it into blue color.
Simply make it really fast missile speed. Literally thousands of speed. And very straight, no arc. Probably no homing in so it remains straight.
And you have something similar like laser (my Draenei towers and their artillery unit).
2) If you, LIKE ME, are not some lame ass allied prism sissy boy, but a real glorious Brotherhood of NOD LASER BYM man, then you need to use the, fk whats its called, i think it is vanilla skyhawk tower disable skill. Where he puts red net on buildings. The DOTA Rasta binding skill. It is lightning effect. Like if you would edit chain lightning or forked lightning skills, and you would change their lightning effect into that red one, then you would get a straight red laser beam.
But it is not good enough, so you need to change its texture, make it straight and bright red, and import into map over the original texture.
Then you make a unit with NO missile art, but you give him lightning attack from the vanilla thunder lizard creep. But ofcourse you edit that thunderlizard's lightning attack skill so that it uses not its blue chainlightning visual but the red one from Shackles skill. And since you edited its texture then now it looks even better. Unit might need to have "instant" attack type, i dont remember. Check the vanilla thunder lizard. Every time it attacks, the "lightning" visual effect will be displayed, and instead of its original blue chainlightning, it will be the straight red line (or any other color when you edit its texture).
BUT, lightning attack skill is the HARDEST orb effect in game! It will not work with any other attack modifying skill! NOT even crit or bash!
(I mean, if you actualy making the whole prism tower and need nice laser hit effects too)
For the damage boost... I doubt it got higher than stack of like +3 towers in RA2. In any case it was one shooting stuff. So no need to make it infinite.
I would do so: Tower has damage aura, in specific range, many levels (affecting only other towers, not self).
You build tower - trigger fires, counts all units of type (prism tower) in specific range of the unit you just built. Then it sets/increases aura level to some value based of how many of these towers are in range.
Then another triger (or even same one with different "event") fires up when a unit dies (of type = prism tower), again counts remaining towers in the range of "position of recently deceased unit" and sets the level of aura accordingly.