I was reading through my Legends today on a newly generated world and found an amazing champion. First, let me establish that all mega beasts were modified to be size 100 instead of size 20.
This champion spent her entire adult career hunting mega and semi mega beasts. Before dying of old age in the town of her birth, she managed to kill 4 Cyclops, 2 Minotaurs, 1 Hydra, 1 Skeletal Dragon, and 2 Titans. The amazing part is that she started her career by losing her left eye to the Hydra. She lost her right eye to the same Hydra 10 years later, and lost her left arm from the shoulder down to the Skeletal Dragon about 100 years later.
The crowning achievement of her career, after pursuing half the mega and semi mega beasts on her list with one arm and totally blind, was finally taking down the Hydra on their third encounter. She apparently lost both legs in this final ordeal, at long last ending her string of escapades, but for the record, she still managed to kill the Hydra and survive.
Strangely, her younger brother also lost his left eye to the same Hydra on that first encounter when he was a guard. However, instead of seeking revenge and hunting mega and semi mega beasts, he immediately quit the guard, joined the priesthood, and started worshiping the Hydra. Funny that...