Toxic

Toxic appears either as Toxic water or Toxic soil.

It may originate from water sources on a map, fall on the ground as acid rain, or be produced in machines as a side effect of using engine oil.

Toxic doesn't spread through a dam or stone bedrock. You can use these elements to stop the poison from spreading.

Once the toxic is isolated, the ground will clean itself after some time.

Also, fresh clean water will wash the toxic from the ground and intoxicated water and take it away from a map.