Players are wise to eliminate small, weak stacks of monsters before they became large, strong stacks. Monsters will also pillage, attack garrisons, raze structures and do various other things to stop the incursion of humans into their territory. Monsters get no special advantages in Olympia. With a couple of minor exceptions, monsters use the same commands as nobles. The only difference between monsters and nobles is that nobles only queue commands at the beginning of the month, while monsters can queue commands at any time.
Cities offer bounties on some monsters.
For example, a city might offer 1 gold for each rat tail. These can then be sold at city markets to collect the bounty. For example, the base price for elf ears is 2 gold, the base price for nazgul tails is 40 gold, and the base price for centaur hides is 5 gold. An unfulfilled bounty will eventually be dropped and replaced with a different bounty.