You are lost and very tired, but suddenly you saw a wooden house surrounded by a fence.  Going to the house, you found a note on the threshold and it became clear that you were in a terrible trap. Now it is clear why there is not a single living soul for many miles.  It seems the village was captured by unknown and very scary creatures. Find a syringe in the house and fill it with a substance that you see in the yard right on the grass.