cRPG is a modification for Mount & Blade II: Bannerlord. It adds persistent multiplayer character stats, hundreds of unique items, an online campaign, clans, duel ladder, a co-op game mode and a few more things.
Seen here the defenders stand atop the siege tower stairs to prevent attackers from coming up as more defenders work to break down the siege tower.
Screenshot taken from NA Siege of Nova Shariz by the Calradian Confederacy.