Bloodsydian is a red crystal mined by slaves for the Gnoll and Ogre armies of the Howling Moors in Kingdom Rush: Origins.
The Bloodsydian stones are much like the Sorcerer's Stone found in the First Elven City, however these blood-red gems activate of their own accord and are unstable, applying different effects to passing units. With each activation, they break into multiple pieces which unite after 16 seconds, signalling that they're ready to activate again.
- 40% chance to heal 200 health to 4 units; enemies only or indiscriminately.
- 30% chance to teleport enemy units further along the path or back up the path.
- 30% chance to transform 3 Gnolls (Gnoll Reavers and Gnoll Burners) into Blood Gnolls, or kill them instantly.
- Bloodsydian is a portmanteau of "blood" and "obsidian," the latter of which is an igneous rock.