Blood Ruby

A is a refining stone used in the refinement process to upgrade an enchantment, runestone, or artifact.

They can be bought on the Zen Market, seperately, and as a containing 3. Additionally these are very rare drops from various Category:Strongbox that themselves are drops from various Lockbox.

Also Blood ruby drop from weekly stronghold quest, castle never (dungeon) as a gold reward, and some quest.

Blutrubin Кровавый рубин