Artemis' Laboratory Blocks

Added

• Complete dark laboratory blockset with a dedicated creative tab.
• Exploration by Cleyton Kauffman and Pondering the Cosmos by Ruskerdax music discs.
• Exploration can be found in abandoned mineshaft chests; Pondering the Cosmos in End City treasure chests, each with a 10% chance. Both also drop from creepers killed by skeletons.
• Laboratory Soundtrack advancement for playing either disc.

Changed

• Existing laboratory advancements now accept dark variants.
• Renamed gray laboratory pillars to dark laboratory pillars, preserving existing blocks and items in saved worlds.

Fixed

• Fixed inventory-based advancements failing when holding stacks larger than one item.