At this momment in game is 3 c'bows: rune, bliurite and bunter c'bow's. Think addeding like new one in game that would be tradable and would have a special atack like seecull. That c bow could be obtained be killing boss withch is now in game or new boss. The c'bow could be "Armadyl c'bow" like in rs oldschool.

We also have crossbows from bronze to adamant. Crossbows already have bolts with special effects, which are in my opinion much better than a special attack that could only be used once in a while.

Well special atack jsut coud do like the special effect from what bolts you are using.

I think we have enough crossbows as is.
Enchanted bolts are already quite good, I'd imagine them being OP with a special attack of some sort.

There are bronze to adamant crossbows as well..