He is an Earth Immortal who has escaped at least three lightning disasters.
There are many types of thunder tribulations. I am talking about the five elements of thunder tribulation, including gold thunder, wood thunder, water thunder, fire thunder and earth thunder.
For example, being struck by a sword is a golden thunder disaster, being hit by a tree is a wood thunder disaster, falling into a river is a water thunder disaster, being burned by fire is a fire thunder disaster, being buried in the earth or being crushed by a mountain wall is an earth thunder disaster. Disaster!
To avoid three thunder tribulations is to have experienced the above three types of thunder tribulations!