Here are a few ideas that I came up with. They might be impossible to do and probably are a little stupid . 😛

– A new type of projectile and projectile launcher that are expensive to craft and use but can break through <i>almost</i> any block in the game.(every shot would have to count)

-A percentage chance for a diamond shot or something else to destroy or damage the block and surrounding blocks near the point on impact.(slowly degrading the more you hammer the defenders build, kind of goes back to the first idea)

-Possible way to make blocks destroyed in siege not drop as items you can pick up?

-A nexus that the defender must protect that pops up in a random part of their base that they must not let get destroyed. If it is destroyed then the attacker could win the siege that way as well maybe?