Talk:Gragas/@comment-93.86.112.212-20121004000527/@comment-4680018-20121004054139

That passive does magic damage over time, not true damage. Using the damage reduction formula you'll find that:

With 30 MR, the base amount, you actually lose about 6.1% of your max HP

With 100 MR you actually lose about 4% of your max HP

With 200 MR you actually lose about 2.67% of your max HP

Also Gragas' passive used to heal 4% over 4 seconds and that gave him far too much sustain. You didn't need to leave lane when you could heal 12% of your max HP in 12 seconds.