Rubies in CAVES AND CLIFFS plus biome and new mob

As an idea for a new cave biome, maybe a blood cave with Ruby ore found within, the water could be a dark red and red drops could drop from the ceiling, a new mob, the blood stalker, could drain your max HP the closer it gets and upon defeat drops rubies and as a rare drop the bloodstalker drops a blood ruby dagger which when attacking does lifesteal. Rubies would be nice to get a fancy red decoration block that isn't emmitting a redstone signal as redstone blocks have a certain look and can break contraptions. Rubies could also function as a beacon base and be used to repair the blood dagger.