There's a Tiger that is a Fortitude Rank of 15 near the very start of Wo Long: Fallen Dynasty. With practice he can be beaten even with your low starting Fortitude rank, but if you don't want to practice and die over and over doing it, this video shows an easy way to cheese him right from the start of the game. It's worth doing as he has a chance to drop some helpful stuff (he also has a chance to drop nothing, just so you know!).
Video showing an actual no damage Tiger fight without cheesing here: • Wo Long: Fallen Dynasty - Early Tiger...