Ruby is one of multiple gemstones you can find while exploring in Hytale, and these stones are very useful for crafting various arcane gear such as staffs and totems, so you don't want to neglect them ...
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Where to find ruby and sapphire in Hytale
Gems like Rubies and Sapphires are needed for making literal magic in Hytale, but they're pretty hard to get.
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