Teamwork
The Iron Mammoth was a Rank 1 beast whose defense capabilities were considered to be top tier amongst beasts of the same rank.
This beast was the single greatest reason why there had been so many casualties during the Battle of Stardale a few months ago.
Although, at the time, the mammoth hadn't directly killed anyone. It had, however, managed to break through the sturdy gates of Stardale, resulting in the enemy forces breaking into the city and massacring countless mortal residents and Magi alike.
The Iron Mammoth's defenses were so strong that despite being bombarded by dozens of Magi stationed at the city wall, it still managed to break through the city's defenses.
Now, the same type of beast had appeared in front of Adam and the rest.
To say that they were shocked out of their minds would be a major understatement.