So I currently believe that the chain gun sorta deal this taken colossus is using may be a new weapon of sorrow. I'm of course basing this off its look which is quite similar to necrochasm and thorn. Further evidence would be the fact that all weapons of sorrow are when either the hive or a guardian try to combine hive magic/tech with weapons not fashioned b6 the hive. So in this case it would be a cabal heavy slug thrower corrupted by the hive. Of course us being able to use it and whether or not it's just a non fleshed out gun is not known yet. So please discuss.