It was theoretically possible for a group of First Grade Mages to scheme and slay a Second Grade giant dragon.
But in truth, it was extremely difficult, so much so that it wasn't viable.
The greatest problem was with the giant dragon's ability to fly.
However, today, four First Grade Mages who had yet to experience planar wars almost succeeded in accomplishing a terrifying and shocking feat– dragonslaying!
But 'almost' was 'almost' after all!
Leon and the others could only give up in pity when their attacks on the green dragon could hardly extinguish the last dying flames of its life, while the fuming knights were closing in on the square.
There were too many variables and unexpected elements in today's battle. Thus, one should not look down upon the power of giant dragons based on today's events.