How to use the effects:
Cast bait: In I, you can place a swarm on an empty field. It collects the yield in the field each round and can be defeated in war to capture the resources.
Cloud harvester: In I, you can either take the yield from a field blocked by a swarm or alternatively select a field occupied by another player and share the yield with them.
Skilled trader: Sell all resources at an increased price of +2 capital.