Legion of Monsters

This mission has one of each of the Queen Ants, King Spiders, Death Queens, and Greater Wild Dragons. There are also numerous smaller cousins of the aforementioned enemies. They are easily group-aggro'd by explosives.

One solution to defeating this level is by having someone bring a long-range sniper rifle to get the attention of the mini-bosses one at a time. Make sure you gain command of the ranger unit on the ground so that they don't charge forward into combat. Back everyone up to the two buildings and take time to prep any Air Raider equipment. Have the sniper aggro the Greater Wild Dragon first, when he paths nearest. Everyone with AoE should hold their fire until he's closer, and then take him down before progressing to the next set. Use the twin buildings as cover from flames (Air Raider's vehicles are also handy for reducing damage taken).

Both the Death Queen and Queen Ant will come with swarms of insects, bugs, and dragons. Ideally, the sniper should lure the Queen Ant out first, but it might be difficult to get her attention without the Death Queen deciding to join in. It should be a survivable battle, at least on Hard Mode, as long as you don't also pull the King Spider.

After defeating each mini-boss and their minions, you can take the time to prepare for the next fight.