Hi,
With the current design it's very hard to do something capable to look like the counterpart of the tyrant :/. Beacause it always look more like a plasma rifle (and also he is very similar to the Lasgun viewtopic.php?f=46&t=1078 you already have.) I know this gun isn't in higher priority so, I've made some research on how should look the most powerfull weapon of Unvanquished (and because I want to do my best ^^).
If you want something not very big, the Arc Beam from Fear 3 is a good exemple of a very powerfull and a bit experimental but still very realistic weapon :
But in every "realistic" shooter, the most powerfull weapons are always machine gun or rocket launcher, and they take a bigger part of the screen , here is an exemple of the rocket launcher from FEAR 3 :
I've take FEAR as ref beacause their concept fit with your artistic direction (more than any UT concept ^^). But I will of course do another design (I will not do the exact same thing as FEAR of course).
So let me know what you think about this,
Have a nice day !
(and sorry for my english I'm on my phone in the metro, so I can't really check my spelling.)