Did a few more test with the same set-up lvl 99 run Shell V active and enhancing skill 221, this time I used "One for All" and measured worms in zeruhn mines casting quake. "One for All" did not negate all the damage from quake, the damage received was consistent at 118. Without "One for All" the damage received is 433, funny because in abyssea the damage received from stonega III and stone IV was 0 with "One for All" active.