This dehacked patch was made by Gokuma
It turns the BFG into a lost soul summoner and the plasma rifle
into a freeze ray.  It's so powerful it can freeze the game.
Seriously, it can freeze the game, normal doom2.exe or Doom Legacy
With Legacy improved z collision detection, mlook, and translucence
you can make some pretty ice sculptures and climb on them.
I recommend running this with Doom Legacy while in win95.
If the game freezes, just press alt+enter and close the dos window.
site: http://gokuma.neocities.org
http://pit.condemned.com
http://geocities.com/shingokuma/doom/