A team mostly with rollers. However, it's best not underestimate them for each roller can guard at least once before your attacks counts. Once you have break their rollers they should all fall easily. Now, the king is a rank 7 plus level 4 Insector. This one can really annihilate your Insectors. It's Crushing Horn is deadly and can cause a chain reaction. Best stratgey is to surround it and attack or if your Insectors can hit from range that would work well.