Vault wall

Since you can’t jump 4 tiles anymore it’s the only way to make a cheap and quick knightproofable only-team wall. Pretty effective.

Dropping tower

-repairable wall
-easy and quick to build
-it uses vaulting features
-and a fact that you can connect a block by a wall to something and then put a ladder, when you removes the wall you have the block attached by the ladder. Simple and useful.