By RAW, I don't know if Zombies are technically allowed to take special attack actions like Shove. However, I think that's kind of a dumb rule. I was watching the zombie battles in Game of Thrones and noticed how the horde was particularly dangerous because the sheer mass of bodies slamming into the defenders prevented them from getting solid swings or maintaining a coherent battle line. It made me think that it would be more interesting in-game to have Zombies charge in with Shove and Grapple attempts to keep the players on the ground, rolling disadvantage on attack rolls or spending actions escaping grapples, rather than just rolling Slam every round. Has anyone ever done this before in your game? Do you think zombies should be too dumb to use such tactics? Would it make for a tougher battle, or would the potentially wasted grapple/shove attempts just lower the average DPR beyond the potential gain?