This mod adds rubies, a new ore that's stronger than netherite.
It also adds two new mobs , a new dimension, a new type of wood, two new villager professions.
You can visit the new dimension by building a portal made of blocks of ruby, and lighting it with the ruby dimension portal igniter.
You can craft command blocks in survival using fragments, crafted using ruby and the glowing ruby, dropped by ruby zombies, an extremely powerful mob that only spawns in rubia.