skill [suggestion]
in the game environment, have a prey/predator type of environment where foes that spawn will also have a prey that spawns around them. these ‘preys’ that spawn will try to escape the foes in the area. this will hopefully create a more lively environment where things in the world are constantly moving around to perform some kind of task rather than just aggro towards players traveling in the world. different kind of environmental foe play would make for a more interesting world (thematic battles where outcomes of the winning side will affect the world or area somehow (with player assistance) without a good or bad side or good or bad affect but different affects).
in underwater environments, have creature behavior like fishes in a fish tank where they’ll follow players near the water surface in groups waiting to be fed. just a nice fish tank feel to water environments.