Buzzing with an ear-shattering drone, this cloud is full of particularly vicious-looking locusts.
Plague Locust Swarm CR 8
A plague locust swarm causes damage to unattended objects in its space each round as though they were creatures, and can even damage normally inedible objects.
A plague locust swarm’s swarm attack deals double damage to creatures of the plant type and to objects made of paper, wood, or other plant materials.
Environment warm deserts or plains
Organization solitary, pair, or calamity (3–64)
Swarms of plague locusts can strip acres of crops bare in an hour, and can depopulate small villages in a day as they move through and devour everything in sight.
Not only do these ravenous pests rend flesh and savage crops, but they also are noted for destroying buildings and other property. Plague locust bites can scour tiles off roofs and weaken the exposed support beams of sheds and stables (to say nothing of what they do to the camels, goats , and horses within). Plague locust swarms are rare and only stream through in large numbers every few years.
Plague locust swarms are often considered to be the work of a demon lord.
Source Pathfinder Adventure Path #79: The Half-Dead City © 2014, Paizo Publishing, LLC; Authors: Crystal Frasier, Jim Groves, Will McCardell, Michael McCarthy, and Amber E.Scott.