"We are going to set up the line." Theo snapped his fingers. Suddenly, three lines of different colors appeared on the map. It wasn't something added previously, it was just Theo improvising with his illusion.
The first line was the outer line which was red in color. "The red line is the danger zone. Basically, it's where we take on their World Class Monsters, including the slime. Since the slime is moving slower than the rest of the monsters, we can set up an ambush after the rest of the monsters pass this line.
"The green line is the safest line, which is the nearest line to the base. This line will become the battlefield against the normal monsters. We are going to station the normal army in this line.