"True damage that would have been mitigated" Seems to not display correctly (& doesn't show up in game) whenever you do % damage.
I was specifically playing Tahm Kench with the rune, I used my W when Conqueror was active and then it messed up.
_**Welcome to Bug Reports!**_
Is there something you really can't do without in the client? Is Udyr displaying as a Picasso painting again? This is the place to report bugs in League of Legends!
Follow the **[Universal Rules](http://boards.euw.leagueoflegends.com/en/c/announcements-en/3eWpXbJi)** and keep content focused on appropriate topics for these Boards.
Use the report button for any post you think deserves the attention of our moderators.