Swap rolling beasts with massive lava feet, it's the meta. Swap rapid destruction with reckless beam. Upgrade that 2 epic heat engine and 1 epic energy mass booster.
Do not upgrade savior resistance and the rare energy booster.
Also get a common teleporter. It needs less energy to use and we don't use tp for dmg so common one is generally best.
You did good job by mything nightmare, it is a good torso.
Can't really give more advices as you got a small amount of extra items to swap. Just keep upgrading your current items and let us know if you got better ones.