Talk:Thornmail/@comment-24.23.196.197-20110505053054/@comment-4002509-20110518091829

Gragas is most likely listed under synergy for it because of the overlap with Drunken Rage. With minimal Cooldown Reduction, Drunken Rage can be active 100% of the time, further reducing all damage taken by 18%. If you are building him tanky, high armor items with other procs and effects will make him even harder to kill, while still being a threat.

Most likely Thornmail is listed under synergy for that reason. High armor combined with backlash on a character who takes 18% less damage already, with the Thornmail damage calculation occurring before the reduction.