What I am about to say is direct nerf, but nothing to his power, just adding more risk for his tower diving; the idea is: Alistar's Unbreakable Will no longer reduces tower damage to him, so if he messes up a tower dive then he pays for it rather than being invincible to the turret; this creates a better and more fair gameplay to play against the cow without affecting Alistar's power levels at all.
Live2LetDie2 votesAllistar is all utility and almost no damage. He is suppose to be a crazy tank that just pushes people around and take tower shots. The fact that he can tank tower is balanced in the sense that he can't do damage meaning
Stacona1 voteshe is still a crazy tank, just shouldn't be against towers - maokai ultimate does not reduce tower damage for a reason, alistar ultimate should not reduce tower damage either
Live2LetDie1 votesMao can do mad so damage with his ult while Ali can't though. Ali is a super tank, that's it, and a super tank should be able to take tower shots no problem. Other tanks can't do it as well because they are damage.
Erockandroll1 votesJust be glad that his Emperor Cowcatine Build got Gutten. His Supper Tankyness doesn't really present a problem, unless it's paired a full damage build.
Stacona1 votesThis is only against towers - so if he messes up a tower dive he gets punished instead of a free ult by clicking R, better counter play is better for the game, not having less counter play