Mind Numbing Substance

Steps
After testing the sample of water you obtained, the test revealed an unknown substance that has strange effects on the mind. Ishaq has asked you to look around the top of the cave for any reason for this finding.
 * 1) Look for anything which could add this substance to the water source
 * 2) * Look for a possible cause for the strange subtance in the water sample
 * 3) ** At the exit of the cave there are two tumble weed looking plants flanking the exit; examine either one of these for the update.
 * 4) Return to Ishaq with your findings
 * 5) * Return to Ishaq

Rewards

 * At least