The Banshee has high resistance and armor, with extraordinary damage reduction.
Against this boss, the Hydra's regular attacks can only inflict around eight hundred damage. Li Yao has the second highest damage after the Hydra, followed by the Arrow Tower.
The pet Little Elves can only cause three hundred damage, which is considered pretty decent.
Although the Hydra is not a tank-type pet, due to its high damage and the taunting ability of the Repair Robot, aggro is relatively stable.
More importantly, the trio of Li Yao are always hiding behind the Hydra to deal damage. The crazed Tina, although wanting to attack Li Yao and his team, gets mostly absorbed by the Hydra.
Also, only the Hydra's hundreds of thousands of health points can withstand the boss's frenzied attacks.
Li Yao's initial output was incredibly scary, with two instances of Rapid Shooting in almost half a minute, collectively dropping the boss's health by over fifty thousand.