Even im not Sion main i find this runes better for late game (are more tanky and better sustain) than with other guides i found. I was able to tank 4 enemy players every single game, no matter if i was facing yasuo, katarina malzahar or any champions who normally can screw you over. Another + about this build is that if you go out of combat with 1% hp you will be ready to fight within 15 seconds again and that is what make you unkilable, your sustain. Just watch out for early game where there are few champions who are ready to rekt you. Thanks for triing this build.
GLHF ;)

and sory for my english im not from english speaking country :)