The idea is to add blocks in the clockworks that can only be broken by dealing a certain damage type to it, like maybe it would be for piercing, shadow, or elemental.
They wouldn't prevent progress, as going back to Haven just because of a roadblock is unfair to any adventurous knight. But it would block off a small area where some treasure boxes could be found and maybe a slightly higher chance to find rarer enemies.

Another variant of these blocks could be blocks destroyed by certain weapon types, like a block line that can only be bombed, or overgrown areas that can only be cut with a sword, or a hole in a seemingly indestructable block that bullets can penetrate to destroy.

It would make more knights bring varieties in their weapons and party up with friends to get the maximum amount of drops while exploring clockworks.

Let me know what you all think and if I need to explain anything deeper.