Talk:Galio/@comment-18470289-20140507082746/@comment-10428734-20140517134259

Zilean's Q deals 1 true damage per tick for minion/turret aggro purposes.

I think it's the last ability in the game that uses this 1 true damage system to drag aggro. Abilities like Anivia's W and Trundle's E used to do the same thing, but that was changed quite a long time ago. However, Zilean is an outdated/underplayed champion that hasn't been touched in ages, so Riot didn't bother re-scripting Time bomb.