So I have been drawing up stats for the main opponents of the Second Act of my campaign and I decided to throw in a Plague Marine as an opponent for the Black Templar Assault Marine in the group. While the character is a blast to write dialogue for (he is quite willing to engage in philosophical discussion and is rather polite) I am having trouble on what to give him as a weapon.
I eventually settled on a Plague Spewer as a ranged weapon but I'm not sure how it would work. I suppose I could have it operate like a Flamer but I am not sure about damage or side effects.
I want this character to be a serious threat to an individual Battle-Brother of around rank 3-4. With this in mind does anyone have ideas for fleshing out a Plague Spewer?
Thanks.