Dig underground tunnels, build rooms and attract creatures at your service, then use your army to annihilate your enemies. Each room has a different use and can attract a specific type of creature, so it's up to you to build the best hive possible. You can even build traps or research new spells to improve your defense capabilities.
Drones will finally get scared by enemy hostile units and will try to run away
Finally. =|
I was getting sick of all my drones dying because they just kinda...Sat there.
As a new behavior drones will try to run on the opposite direction of the enemy threat.
If the path is blocked they will run to the hive heart.
If an enemy is too close to the heart then drones will try to defend it.