Now, onto business.
I'm trying to create a campaign based around sieging a holy orders city and temple. The weekly goals would be things like breaching walls or gatehouses, finding supply rooms, disrupting supply lines, preventing messengers from leaving or entering, etc.
The PCs would be on the side of evil. I'd like them to be something other than standard humanoids, but, I'm having trouble thinking of monsters that would work without being overly powerful/disruptive to the cohesiveness of the campaign.
Thanks in advance for any advice.