Sett W true damage has the same bug with conqueror as Urgot with conqueror...
No wonder his winrate is soo high, Remember when urgot would ult someone and then heal off the damage? yup Urgot healed 9999, Well now its the same situation but with Sett W, since true damage aoe doesn't get reduced healing, he heals off for 15% of all the champion his with W LOL.