After those four, Theo and Ava started killing the rest of the monsters one by one. He utilized his Magic Bullets mainly as a distraction while his normal swing, especially with the help of his Materialization, became the greatest weapon that suppressed them.
Although it was true that Theo wouldn't be able to do anything if he fought the level 400 Ground Dragon alone, it still didn't change the fact Theo's strike was powerful enough to kill it.
Not a single of the monsters could block the attack and die on the spot.
Of course, using Materialization, Telekinesis, External Flow, and Cannon Blast exhausted his Magic Power reserve at a rapid rate. Even if he could kill the monsters quickly, he still had his limit.
*Sigh!*
Theo wiped the sweats on his forehead and put the mask back on. He looked down and saw all the corpses lying around.