So my 4 players are all currently level 5 and are entering the ruins of this castle, where they will meet a goblin artificer who just had his shield guardians destroyed by them, and a paladin tabaxi who will hopefully accompany them for a time. Whilst they rest up in the castle I was hoping to initiate some sort of siege against them by a great beast but I don't know what beast I could use as a threat like this other than a young red dragon (which I dont' wanna use). Currently the story arc theyre in is extremely lycan heavy and I'd like to incorporate that as well but there's really not much choice
Any and all help would be appreciated