There's no such thing as absolutely impossible to kill, but do you think an individual in wulin who had the following defenses be practically impossible to kill in wulin?
1. inner power level of the Janitor Monk
2. complete mastery of Shaolin's Diamond Body Technique
3. swallowed the beasts that gave Deun Yu immunity from poison
4. wears Wong Yung's soft body armor
5. on top (or beneath) that, also wears that body armor from Gu Long's SENTIMENTAL SWORDSMAN, RUTHLESS SWORD
6. complete mastery of Ling Bor Mei Bo hing gung technique
7. complete mastery of Dook Goo Kau Bai's assorted "breaking" sword stances
Would someone who had all that be essentially impossible to kill through conventional wulin means?