[Hyperspace] Make monument more defendable

[fixitqixit]

Map name

Hyperspace by Kalikakitty

Is your feature request related to a problem?

The map is impossible to defend due to awkwardly constructed monument. This problem is exacerbated by the monument being made from gold blocks which makes it notoriously easy to destroy.

Describe the solution you'd like

There should be less obsidian around the core so that defenders can clear out space to build a defence. The monument should also be made from more difficult to destroy blocks.