The Red Starstone is a currency item in Lineage 2: Revolution.
When donated to a clan it can be used by the clan leader to reset the clan dungeon before weekly reset.
Summary[ | ]
Any mob with the title above their name 'Evil of Blood' will have a chance to drop both Proof of Blood and Red Starstone.
For a list of elite dungeon mobs that drop these currencies, see Proof of Blood.