Marble cavern is a cave biome with marble covering the walls. Marble is a white stone material, similar to quartz, but in a cooler tone and slightly darker. Pulsite ore also spawn exclusively here.
Pulsite ore can drops pulsite when mined. Pulsite ore also shoots out an arc of energy when mined halfway. Pulsite can be crafted into armour/tools, which can be charged using a pulsite charger which runs on amber blocks or maybe pulsite. Pulsite items have a half-charge and a full-charge
When charged it gives helpful status effects/improves the efficiency of a tool that improves general work but is terrible at combat. Boots give leaping, pants give speed, chestplate gives haste, helmet gives night vision/water breathing. Swords and axes gain an electric arc attack for better cleanup and tools increase in breaking speed if it breaks the same block multiple times(resets when breaking a different block) Charged armour and tools when not charged are as good as iron armour.
Lastly, pulsite can be used to craft the end version of a respawn anchor. It also uses the same materials as a pulsite charger
This charged armour is inspired by SystemZee's copper armour