Because you love pain promethium chunks now spoil. You will most likely need to bring biter eggs to the shattered planet and not the chunks back.

Once promethium chunks decay they can then be crushed to harvest some heavy metals from space. Also adds tech to increase the productivity of crushing decayed promethium chunks.

If you really want to make things interesting adds an option for "overclocked railguns". This will completely uncap the shooting speed of railguns making them far more effective at one-shotting everything they see. To compensate the cost of railgun ammo has been increased significantly increased using the resources obtained from decayed promethium crushing.