*Please note that nothing exists in Universe rcz00123 if not created IC. While this thread may be used to compile ideas/plans, don't forget to rp out their creation.
A black vine with green flecks that grows only in the volcanic soil around one of the mountains of the First Planet. Their sturdy stems, when cut or corroded, issues an amber sap that serves as sustenance for the local species of larva, but in sufficient doses (depending on the mass of the victim) is fatal to any other organic lifeform when it enters their bloodstream, causing a rapid failure of their internal organs as it spreads. Even a single drop causes an agonizing, burning pain for days in the area exposed to it.
A blue-hued, delicate flower that grows at the South Pole of the First Planet. When its petals are pounded and boiled in water, a single flower provides sufficient dosage when adminstered orally to halt the progression of any toxin and disease in a single organism's body within the hour. Inhabitants of the planet will likely discover that it is the only cure to the sap of the Kinslayer's Vine.