This mod is great for defending against bloodmoon hordes. Make a moat, it has to be made of cube blocks otherwise it will leak, with cube blocks around your base. Place log spikes at the bottom of the moat with one block layer of eel traps over the log spikes and then setup a bridge of sorts to get between the moat an base entrance. The only problem is looting the moat.
The forum topic of the mod is here.
Credits: Noisy Pants
By any chance, this will be updated for A21/22? Thanks!